Order
Now
Product
Folder
Support &
Community
Tools &
Software
Technical
Documents
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
TPS25740, TPS25740A USB Type-C and USB PD Source Controller
1 Features
3 Description
•
The TPS25740, TPS25740A implements a source
that is compliant to USB Power Delivery 2.0 version
1.2 and Type-C revision 1.2. It monitors the CC pin to
detect when a USB Type-C sink is attached, then it
enables a N-ch MOSFET gate driver to turn on
VBUS. The device then offers up to three different
voltages using USB Power Delivery. Four input pins
(PSEL, HIPWR, PCTRL, and (EN12V or EN9V) are
used to configure the voltages and currents
advertised. The device uses the CTL1 and CTL2 pins
to select one of three voltages from the power supply
based on the voltage requested by the attached sink.
The device automatically handles discharging the
VBUS output per USB PD requirements.
1
•
•
•
•
•
•
•
USB Power Delivery (PD) 2.0 Certified Provider,
USB Type-C™ Rev. 1.2 Compliant Source
Pin-Selectable Voltage Advertisement
– 5 V, 12 V, and/or 20 V (TPS25740)
– 5 V, 9 V, and/or 15 V (TPS25740A)
Pin-Selectable Peak Power Settings
– 12 options 15 W – 100W (TPS25740)
– 11 options 15 W – 81W (TPS25740A)
High Voltage and Safety Integration
– Overvoltage, Overcurrent, Overtemperature
Protection and VBUS Discharge
– IEC 61000-4-2 Protection on CC1 and CC2
– Input Pin for Fast Shutdown Under Fault
– Control of External N-ch MOSFET
– 2-pin External Power Supply Control
– Wide VIN Supply (4.65 V – 25 V)
Below 10 µA Quiescent Current when Unattached
Port Attachment Indicator
Port Power Management
Built-In 1.8 V at 35 mA Supply Output
The TPS25740, TPS25740A typically draws 8.5 µA
(or 5.8 µA if VDD = 3.3 V) when no device is
attached. Additional system power saving is
achievable by using the Port Attachment Indicator
(UFP) output to disable the power source when no
device is attached.
Protection features include overvoltage protection,
overcurrent protection, over-temperature protection,
IEC for CC pins, and system override to disable the
gate driver (GD).
Device Information(1)
2 Applications
•
•
•
•
•
PART NUMBER
USB-PD Adaptor (data-less)
Dedicated Charging Port (data-less)
Power Hub (data-less)
Power Bank
Cigarette Lighter Adaptor (CLA)
TPS25740
TPS25740A
PACKAGE
BODY SIZE (NOM)
QFN (24)
4.00 mm x 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
From AC Mains
CSD17579Q3A
VBUS
+
T1
UCC24636
Type-C
Plug
t
P
P
T1
LDO
VDD
HV
CC2
CC1
VBUS
ISNS
DSCG
HIPWR
PSEL
EN12V / EN9V
GND
AGND
TL431
P
VDD
TPS25740
TPS25740A
DVDD
GND
PCTRL
CTL1
CTL2
FB
GDNS
CS
P
VAUX
GD
VTX
VPWR
DRV
GDNG
UCC28740
VS
UFP
Power Supply
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Device Comparison Table.....................................
Pin Configuration and Functions .........................
Specifications.........................................................
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
8
Absolute Maximum Ratings ...................................... 6
ESD Ratings ............................................................ 6
Recommended Operating Conditions....................... 7
Thermal Information .................................................. 7
Electrical Characteristics........................................... 8
Timing Requirements .............................................. 11
Switching Characteristics ........................................ 12
Typical Characteristics ............................................ 16
Detailed Description ............................................ 18
8.1
8.2
8.3
8.4
9
1
1
1
2
4
4
6
Overview .................................................................
Functional Block Diagram .......................................
Feature Description.................................................
Device Functional Modes........................................
18
20
20
35
9.1 Application Information............................................ 36
9.2 Typical Application , A/C Power Source (Wall
Adapter) ................................................................... 44
9.3 System Examples ................................................... 51
10 Power Supply Recommendations ..................... 54
10.1 VDD....................................................................... 54
10.2 VPWR ................................................................... 54
11 Layout................................................................... 55
11.1 Port Current Kelvin Sensing.................................. 55
11.2 Layout Guidelines ................................................. 55
11.3 Layout Example .................................................... 56
12 Device and Documentation Support ................. 57
12.1
12.2
12.3
12.4
12.5
12.6
12.7
Documentation Support ........................................
Related Links ........................................................
Receiving Notification of Documentation Updates
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
57
57
57
57
57
57
57
13 Mechanical, Packaging, and Orderable
Information ........................................................... 57
Application and Implementation ........................ 36
4 Revision History
Changes from Revision A (May 2016) to Revision B
Page
•
Added Feature: Port Power Management ............................................................................................................................. 1
•
Changed the Input resistance MAX value From: 5 MΩ To: 6 MΩ in the Electrical Characteristics table .............................. 9
•
Changed the unloaded output voltage on CC pin, V(OCN) MIN value From: 2.8 V To: 2.7 V and the MAX value From
5.5 V To: 4.35 V in the Electrical Characteristics table ........................................................................................................ 10
•
Deleted tWD Watchdog Timer From the Timing Requirements table .................................................................................... 11
•
Changed the tST TYP value From: 24 ms To: 30 ms in the Switching Characteristics table .............................................. 12
•
Deleted sentence from Output Power Supply (DVDD): "It will also be pulsed high for tCcDeb every tWD when there is
nothing connected." ............................................................................................................................................................. 34
•
Deleted the last sentence from the Sleep Mode section: "The device also wakes up every tWD and checks for a
connection before returning to sleep mode."........................................................................................................................ 35
•
Added test: "The TPS25740/TPS25740A Design Calculator Tool.." to the Application Information section ....................... 36
•
Changed capacitor From: 10 µF To: 6.8 µF in the Figure 36 .............................................................................................. 36
•
Added sentence "All slew rate control methods" to the Voltage Transition Requirements section...................................... 41
•
Changed section title From: VOUT Ripple Filtering using RF and CF To: Tuning OCP Using RF and CF. Updated
section text............................................................................................................................................................................ 43
•
Changed From: A 10 µF, 25 V, ±10% X5R or X7R ceramic capacitor To: A 6.8 µF, 25 V, ±10% X5R or X7R ceramic
capacitor in the Configurable Components section.............................................................................................................. 45
•
Changed From: "Type-C receptacle" To: "Type-C plug" in Figure 56.................................................................................. 48
•
Changed From: A 10 µF, 25 V, ±10% X5R or X7R ceramic capacitor to: A 6.8 µF, 25 V, ±10% X5R or X7R ceramic
capacitor in the Configurable Components section.............................................................................................................. 49
•
Changed section title From: Dual-Port A/C Power Source (Wall Adaptor) To: Dual-Port Power Managed A/C Power
Source (Wall Adaptor) .......................................................................................................................................................... 53
•
Added the TPS25740/TPS25740A Design Calculator Tool link and the TPS25740EVM-741 and TPS25740AEVM741 EVM User's Guide link to the Documentation Support section ..................................................................................... 57
2
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Changes from Original (March 2016) to Revision A
•
Page
Changed From: Product Preview To: Production Data ......................................................................................................... 1
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
3
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
5 Device Comparison Table
DEVICE NUMBER
VOLTAGE OPTION
TPS25740
Offers 5 V, 12 V, and 20 V
TPS25740A
Offers 5 V, 9 V, and 15 V
6 Pin Configuration and Functions
DSCG
GDNS
GDNG
VBUS
VPWR
ISNS
24
23
22
21
20
19
RGE Package
24-Pin VQFN
Top View
VTX
1
18
AGND
CC1
2
17
VDD
CC2
3
16
VAUX
Thermal
Pad
12
DVDD
PSEL
13
11
6
UFP
CTL1
10
PCTRL
N/C
14
9
5
N/C
HIPWR
8
GD
EN12V/EN9V
15
7
4
CTL2
GND
Pin Functions
PIN
NAME
NO.
I/O
DESCRIPTION
VTX
1
O
Bypass pin for transmit driver supply. Connect this pin to GND via the recommended ceramic capacitor.
CC1
2
I/O
Multifunction configuration channel interface pin to USB Type-C. Functions include connector polarity,
end-device connection detect, current capabilities, and PD communication.
CC2
3
I/O
Multifunction configuration channel interface pin to USB Type-C. Functions include connector polarity,
end-device connection detect, current capabilities, and PD communication.
GND
4
—
Power ground is associated with power management and gate driver circuits. Connect to AGND and PAD.
HIPWR
5
I
Four-state input pin used to configure the voltages and currents that will be advertised. It may be
connected directly to GND or DVDD, or it may be connected to GND or DVDD via a resistance R(SEL) .
CTL1
6
O
Digital output pin used to control an external voltage regulator.
CTL2
7
O
Digital output pin used to control an external voltage regulator.
I
For TPS25740:
If it is pulled low, then the 12 V PDO may be transmitted. If it is not pulled low, the 12-V PDO will not be
advertised.
For TPS25740A:
If it is pulled low, then the 9 V PDO may be transmitted. If it is not pulled low, the 9-V PDO will not be
advertised.
EN12V / EN9V
8
N/C
9
Connect to GND.
N/C
10
Connect to GND.
4
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Pin Functions (continued)
PIN
NAME
NO.
I/O
DESCRIPTION
UFP
11
O
Open drain output pin used to indicate that either CC1 or CC2 (but not both) is pulled down by a USB
Type-C Sink.
PSEL
12
I
A four-state input used for selecting the maximum power that can be provided. It may be connected
directly to GND or DVDD, or it may be connected to GND or DVDD via a resistance R(SEL)
DVDD
13
O
Internally regulated 1.85 V rail for external use up to 35 mA. Connect this pin to GND via the
recommended bypass capacitor .
PCTRL
14
I
Input pin used to control the power that will be advertised. It may be pulled high or low dynamically.
GD
15
I
Master enable for the GDNG/GDNS gate driver. The system can drive this low to force the power path
switch off.
VAUX
16
O
Internally regulated rail for use by the power management circuits. Connect this pin to GND via the
recommended bypass capacitor.
VDD
17
I
Optional input supply.
AGND
18
—
ISNS
19
I
The ISNS input is used to monitor a VBUS-referenced sense resistor for over-current events.
VPWR
20
I
Connect to an external voltage as a source of bias power. If VDD is supplied, this supply is optional while
UFP is high.
VBUS
21
I
The voltage monitor for the VBUS line.
GDNG
22
O
High-voltage open drain gate driver which may be used to drive NMOS power switches. Connect to the
gate terminal.
GDNS
23
I
High-voltage open drain gate driver which may be used to drive NMOS power switches. Connect to the
source terminal.
DSCG
24
O
Discharge is an open-drain output that discharges the system VBUS line through an external resistor.
PAD
Analog ground associated with monitoring and power conditioning circuits. Connect to GND and PAD.
Connect PAD to GND / AGND plane.
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
5
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
7 Specifications
7.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
MIN
MAX
UNIT
–0.3
6
V
–0.3
2.1
V
–0.3
4.5
V
–0.3
7
V
–0.3
2.1
V
GDNG (2)
–0.5
40
V
VBUS,VPWR, ISNS, DSCG, GDNS
–0.5
30
V
VBUS,VPWR, ISNS, DSCG, GDNS
–1.5
30
V
V(GDNG) – V(GDNS)
–0.3
20
V
AGND to GND
–0.3
0.3
V
ISNS to VBUS
–0.3
0.3
V
8
mA
GD
100
µA
DSCG
10
mA
DSCG
375
mA
VDD , EN12V, EN9V, CTL1, CTL2, UFP,
PCTRL, CC1, CC2
VTX
(2)
VAUX (2)
Pin Voltage (sustained)
GD
(3)
HIPWR, PSEL, DVDD
Pin Voltage (transient for 1ms)
Pin-to-pin voltage
(2)
CTL1, CTL2, UFP
Sinking current (average)
Sinking current (transient, 50 ms pulse 0.25%
duty cycle)
VTX
Internally limited
mA
CC1, CC2
Internally limited
mA
VAUX
0
25
µA
Operating junction temperature range, TJ
–40
125
°C
Storage temperature, Tstg
–65
150
°C
Current sourcing
(1)
(2)
(3)
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Do not apply voltage to these pins.
Voltage allowed to rise above Absolute Maximum provided current is limited.
7.2 ESD Ratings (1)
VALUE
V(ESD)
(1)
(2)
(3)
(4)
6
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (2)
±2500
Charged-device model (CDM), per JEDEC specification JESD22C101 (3)
±1000
IEC
(4)
61000-4-2 contact discharge, CC1, CC2
±8000
IEC
(4)
61000-4-2 air-gap discharge, CC1, CC2
±15000
UNIT
V
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate
precautions. Failure to observe proper handling and installation procedures can cause damage.
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
These results were passing limits that were obtained on an application-level test board. Individual results may vary based on
implementation. Surges per IEC61000-4-2, 1999 applied between CC1/CC2 and ground of TPS25740EVM-741 and TPS25740AEVM741
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
VIN
VDD
Supply Voltage
VI
VI
Pin-to-pin voltage
VIH
High-Level Input Voltage
VIL
Low-Level Input Voltage
5.5
V
25
V
EN12V, EN9V, PCTRL, CC1, CC2,
CTL1, CTL2
0
5.5
V
GD
0
6.5
V
DSCG, GDNS, VBUS
0
25
V
HIPWR, PSEL
0
DVDD
V
ISNS - VBUS
–0.1
0.1
V
EN12V, EN9V
1.4
V
PCTRL
2
V
GD
2
V
EN12V, EN9V
0.5
V
PCTRL
1.6
V
GD
1.6
V
GD
Sinking Current
DSCG, transient sinking current 50 ms
pulse, 0.25% duty cycle
DSCG, average
CC1, CC2 (C(RX))
200
560
VBUS (C(PDIN))
CS
Shunt capacitance
RS
Sense resistance
R(PUD)
Pull up/down resistance
R(DSCG)
TJ
5
mA
80
µA
350
mA
5
mA
600
pF
10
µF
DVDD (C(DVDD))
0.198
0.22
0.242
µF
VAUX (C(VAUX))
0.09
0.1
0.11
µF
VTX (C(VTX))
0.09
0.10
0.11
µF
VDD (C(VDD))
0.09
Configured for 3 A
5
6.4
mΩ
Configured for 5 A
5
5.8
mΩ
1
kΩ
120
kΩ
HIPWR, PSEL (direct to GND or direct
to DVDD)
Series resistance
UNIT
0
CTL1, CTL2, UFP
IS
MAX
4.65
VPWR
Applied Voltage
NOM
µF
0
HIPWR, PSEL (R(SEL) )
80
Maximum VBUS voltage of 25 V
80
Ω
Maximum VBUS voltage of 15 V
43
Ω
Maximum VBUS voltage of 6 V
20
Operating junction temperature
100
Ω
-40
125
°C
7.4 Thermal Information
THERMAL METRIC (1)
TPS25740
TPS25740A
RGE (VQFN)
UNIT
24 PINS
RθJA
Junction-to-ambient thermal resistance
RθJC(top)
Junction-to-case (top) thermal resistance
RθJB
Junction-to-board thermal resistance
ψJT
Junction-to-top characterization parameter
ψJB
RθJC(bot)
(1)
33
°C/W
32.6
°C/W
10
°C/W
0.4
°C/W
Junction-to-board characterization parameter
10
°C/W
Junction-to-case (bottom) thermal resistance
2.6
°C/W
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
7
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
7.5 Electrical Characteristics
Unless otherwise stated in a specific test condition the following conditions apply: –40°C ≤ TJ ≤ 125°C; 3 ≤ VDD ≤ 5.5 V, 4.65
V ≤ VPWR ≤ 25 V; HIPWR = GND, PSEL = GND, GD = VAUX, PCTRL = VAUX, AGND = GND; VAUX, VTX, bypassed with
0.1 µF, DVDD bypassed with 0.22 µF, EN12V = GND and EN9V = GND; all other pins open (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Voltage Comparator (VBUS)
V(VBUS_RTH)
VBUS Threshold (Rising voltage)
4.25
4.45
4.65
V
V(VBUS_FTH)
VBUS Threshold (Falling voltage)
3.5
3.7
3.9
V
VBUS Threshold (Hysteresis)
0.75
V
Power Supply (VDD, VPWR)
V(VDD_TH)
VDD UVLO threshold
Rising voltage
2.8
2.91
2.97
Falling voltage
2.8
2.86
2.91
Hysteresis, comes into effect once the
rising threshold is crossed.
V
0.05
V(VPWR_RTH)
VPWR UVLO threshold rising
Rising voltage
4.2
4.45
4.65
V
V(VPWR_FTH)
VPWR UVLO threshold falling
Falling voltage
3.5
3.7
3.9
V
VPWR UVLO threshold hysteresis
Hysteresis, comes into effect once the
rising threshold is crossed.
Supply current drawn from VDD in sleep
mode
Supply current drawn from VPWR in
sleep mode
I(SUPP)
0.75
VPWR = 0 V, VDD = 5 V, CC1 and CC2
pins are open.
9.2
20
µA
VPWR = 0 V, VDD = 5 V,CC1 pin open,
CC2 pin tied to GND.
94
150
µA
VPWR = 5 V, VDD = 0 V, CC1 and CC2
pins are open.
8.5
15
µA
VPWR = 5 V, VDD = 0 V, CC1 pin open,
CC2 pin tied to GND.
90
140
µA
1.8
3
mA
PD Sourcing active, VBUS = 5 V,
VPWR = 5 V, VDD = 3.3 V
Operating current while sink attached
V
1
Over/Under Voltage Protection (VBUS)
5 V PD contract
V(FOVP)
Fast OVP threshold, always enabled
5.8
6.05
6.3
V
12 V PD contract (TPS25740)
13.2
13.75
14.3
V
20 V PD contract (TPS25740)
22.1
23.05
24.0
V
9 V PD contract (TPS25740A)
10.1
10.55
11.0
V
15 V PD contract (TPS25740A)
16.2
16.95
17.7
V
5.5
5.65
5.8
V
12 V PD contract (TPS25740)
13.1
13.4
13.7
V
20 V PD contract (TPS25740)
21.5
22.0
22.5
V
9 V PD contract (TPS25740A)
10
10.2
10.4
V
16.3
16.5
17
V
5 V PD contract
3.5
3.65
3.8
V
12 V PD contract (TPS25740)
9.2
9.45
9.7
V
20 V PD contract (TPS25740)
15.7
16.1
16.5
V
9 V PD contract (TPS25740A)
6.8
6.95
7.1
V
15 V PD contract (TPS25740A)
11.7
11.95
12.2
V
2.875
3.2
4.1
5 V PD contract
Slow OVP threshold, disabled during
voltage transitions. (See Figure 1)
V(SOVP)
15 V PD contract (TPS25740A)
UVP threshold, disabled during voltage
transitions (See Figure 1)
V(SUVP)
VAUX
V(VAUX)
Output voltage
0 ≤ I(VAUX) ≤ I(VAUXEXT)
VAUX Current limit
I(VAUXEXT)
1
External load that may be applied to
VAUX.
V
5
mA
25
µA
1.95
V
V
DVDD
V(DVDD)
8
Output voltage
0 mA ≤ I(DVDD) ≤ 35 mA, CC1 or CC2
pulled to ground via 5.1 kΩ, or both CC1
and CC2 pulled to ground via 1 kΩ
1.75
Load Regulation
Overshoot from V(DVDD), 10-mA minimum,
0.198-µF bypass capacitor
1.7
2
Current limit
DVDD tied to GND
40
150
Submit Documentation Feedback
1.85
mA
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Electrical Characteristics (continued)
Unless otherwise stated in a specific test condition the following conditions apply: –40°C ≤ TJ ≤ 125°C; 3 ≤ VDD ≤ 5.5 V, 4.65
V ≤ VPWR ≤ 25 V; HIPWR = GND, PSEL = GND, GD = VAUX, PCTRL = VAUX, AGND = GND; VAUX, VTX, bypassed with
0.1 µF, DVDD bypassed with 0.22 µF, EN12V = GND and EN9V = GND; all other pins open (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
1.050
1.125
1.200
V
VTX
Output voltage
Not transmitting or receiving, 0 to 2 mA
external load
Current Limit
VTX tied to GND
2.5
10
mA
Gate Driver Disable (GD)
Rising voltage
V(GD_TH)
Input enable threshold voltage
V(GDC)
Internal clamp voltage
I(GD) = 80 µA
R(GD)
Internal pulldown resistance
From 0 V to 6 V
Discharge (DSCG)
1.64
Hysteresis
1.725
1.81
0.15
V
V
6.5
7
8.5
V
3
6
9.5
MΩ
(1) (2)
V(DSCGT)
ON state (linear)
I(DSCG) = 100 mA
0.15
0.42
1
I(DSCGT)
ON state (saturation)
V(DSCG) = 4 V, pulsed mode operation
220
553
1300
mA
V
R(DSCGB)
Discharge bleeder
While CC1 is pulled down by 5.1 kΩ and
CC2 is open, V(DSCG) = 25 V
6.6
8.2
10
kΩ
Leakage current
0 V ≤ V(DSCG) ≤ 25 V
2
µA
30
µA
N-ch MOSFET Gate Driver (GDNG,GDNS)
0 V ≤ V(GDNS) ≤ 25 V,
0 V ≤ V(GDNG) – V(GDNS) ≤ 6 V
I(GDNON)
Sourcing current
V(GDNON)
Sourcing voltage while enabled
(V(GDNG)– V(GDNS))
R(GDNGOFF)
Sinking strength while disabled
Sinking strength UVLO (safety)
Off-state leakage
13.2
20
0 V ≤ V(GDNS) ≤ 25 V, I(GDNON) ≤ 4 µA,
VPWR = 0 V
7
12
V
0 V ≤ V(GDNS) ≤ 25 V, I(GDNON) ≤ 4 µA,
VDD = 0 V
8.5
12
V
300
Ω
V(GDNG) – V(GDNS)= 0.5 V,
0 ≤ V(GDNS) ≤ 25 V
150
VDD = 1.4 V, V(GDNG) = 1 V,
V(GDNS) = 0 V, VPWR = 0 V
145
µA
VPWR = 1.4 V, V(GDNG) = 1 V,
V(GDNS) = 0 V, VDD = 0 V
145
µA
V(GDNS) = 25 V, V(GDNG) open
7
µA
Power Control Input (PCTRL)
V(PCTRL_TH)
Voltage rising
Threshold voltage (3)
1.65
Hysteresis
Input resistance
1.75
1.85
100
0 V ≤ V(PCTRL) ≤ V(VAUX)
1.5
0 V ≤ V(HIPWR) ≤ V(DVDD),
0 V ≤ V(PSEL) ≤ V(DVDD)
–1
2.9
V
mV
6
MΩ
1
µA
0.4
V
0.5
µA
Voltage Select (HIPWR), Power Select (PSEL) (4)
Leakage current
Port Status and Voltage Control (CTL1, CTL2, UFP)
VOL
Output low voltage
Leakage Current
(1)
(2)
(3)
(4)
(5)
(6)
(5)
IOL = 4 mA sinking
In Hi-Z state, 0 ≤ V(CTLx) ≤ 5.5 V or
0 ≤ VUFP ≤ 5.5V
(6)
–0.5
If TJ1 is perceived to have been exceeded an OTSD occurs and the discharge FET is disabled.
The discharge pull-down is not active in the sleep mode.
When voltage on the PCTRL pin is less than V(PCTRL_TH), the amount of power advertised is reduced by half.
Leaving HIPWR or PSEL open is an undetermined state and leads to unpredictable behavior.
These pins are high-z during a UVLO, reset, or in Sleep condition.
The pins were designed for less leakage, but testing only verifies that the leakage does not exceed 0.5 µA.
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
9
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
Electrical Characteristics (continued)
Unless otherwise stated in a specific test condition the following conditions apply: –40°C ≤ TJ ≤ 125°C; 3 ≤ VDD ≤ 5.5 V, 4.65
V ≤ VPWR ≤ 25 V; HIPWR = GND, PSEL = GND, GD = VAUX, PCTRL = VAUX, AGND = GND; VAUX, VTX, bypassed with
0.1 µF, DVDD bypassed with 0.22 µF, EN12V = GND and EN9V = GND; all other pins open (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
0.585
V
Enable 9 V, 12 V Capability (EN9V, EN12V)
Input low threshold voltage
Input high threshold voltage
1.225
Input hysteresis
V
0.25
V
Transmitter Specifications (CC1, CC2)
RTX
Output resistance (zDriver from USB PD
in Documentation Support)
During transmission
V(TXHI)
Transmit high voltage
V(TXLO)
Transmit low voltage
33
45
75
External Loading per Figure 25
1.05
1.125
1.2
V
External Loading per Figure 25
–75
75
mV
Ω
Receiver Specifications (CC1, CC2)
V(RXHI)
Receive threshold (rising)
800
840
885
mV
V(RXLO)
Receive threshold (falling)
485
525
570
mV
Receive threshold (Hysteresis)
V(INT)
315
Interference is 600 kHz square wave,
rising 0 to 100 mV.
Amplitude of interference that can be
tolerated
Interference is 1 MHz sine wave
mV
100
mV
1
VPP
DFP Specifications (CC1, CC2)
In standard DFP mode (7), voltage rising
V(DSTD)
V(D1.5)
Detach threshold when cable is detached.
V(OCDS)
I(RPSTD)
I(RP1.5)
In 1.5 A DFP mode (8), voltage rising
1.52
1.585
2.50
2.625
Hysteresis
Loaded output current while connected
through CCx
I(RP3.0)
V(RDSTD)
V
1.8
5.5
V
In standard DFP mode1, CCy open,
0 V ≤ VCCx ≤ 1.5 V (vRd)
64
80
96
µA
In 1.5 A DFP mode 2, CCy open,
0 V ≤ VCCx ≤ 1.5 V (vRd)
166
180
194
µA
In 3 A DFP mode 3, CCy open,
0 V ≤ VCCx ≤ 1.5 V (vRd)
304
330
356
µA
In standard DFP mode1,
0 V ≤ VCCx ≤ 1.5 V (vRd)
0.15
0.19
0.23
V
0.02
0.35
0.39
V
0.43
0.02
In 3 A DFP mode3, CCy open
0 V ≤ VCCx ≤ 1.5 V (vRd)
0.75
0.79
VPWR = 4.65 V , 0 V ≤ VDD ≤ 3 V
1.6
I(DSDFP)
Output current on CCx in sleep mode to
detect Ra removal.
CCx = 0V, CCy floating
40
73
V
V
0.83
0.02
V(WAKE)
10
V
VPWR = 0 V (in UVLO) or in sleep mode
Hysteresis
(8)
(9)
V
4.35
Wake threshold (rising and falling), exit
from sleep mode
(7)
V
2.75
2.7
Hysteresis
V(RD3.0)
V
normal mode
In 1.5 A DFP mode2, CCy open
0 V ≤ VCCx ≤ 1.5 V (vRd)
Ra, Rd detection threshold (falling)
V
V
1.65
0.05
Hysteresis
V(RD1.5)
1.65
0.02
Hysteresis
Unloaded output voltage on CC pin
1.585
0.02
In 3 A DFP mode (9), voltage rising
V(D3.0)
V(OCN)
1.52
Hysteresis
V
V
3.0
V
105
µA
Standard DFP mode is active after a USB Type-C sink, debug accessory, or audio accessory is attached until the first USB PD message
is transmitted (after GDNG has been enabled).
1.5 A DFP mode is active after a USB PD message is received.
3 A DFP mode is active after GDNG has been enabled until a USB PD message is received.
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Electrical Characteristics (continued)
Unless otherwise stated in a specific test condition the following conditions apply: –40°C ≤ TJ ≤ 125°C; 3 ≤ VDD ≤ 5.5 V, 4.65
V ≤ VPWR ≤ 25 V; HIPWR = GND, PSEL = GND, GD = VAUX, PCTRL = VAUX, AGND = GND; VAUX, VTX, bypassed with
0.1 µF, DVDD bypassed with 0.22 µF, EN12V = GND and EN9V = GND; all other pins open (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
19.2
22.6
mV
29
34
mV
OverCurrent Protection (ISNS, VBUS)
Specified as V(ISNS)-V(VBUS).
3.5 V (10) ≤ VBUS ≤ 25 V
VI(TRIP)
Current trip shunt voltage
HIPWR: 5 A not enabled
HIPWR = DVDD (5 A enabled)
OTSD
TJ1
Die Temperature (Analog) (11)
TJ2
Die Temperature (Analog)
TJ ↑
125
Hysteresis
TJ ↑
(12)
135
145
°C
10
140
Hysteresis
150
163
°C
10
(10) Common mode minimum aligns to VBUS UVLO. VBUS must be above its UVLO for the OCP function to be active.
(11) When TJ1 trips a hard reset is transmitted and discharge is disabled, but the bleed discharge is not disabled.
(12) TJ2 trips only when some external heat source drives the temperature up. When it trips the DVDD, and VAUX power outputs are turned
off.
7.6 Timing Requirements
Unless otherwise stated in a specific test condition the following conditions apply: –40°C ≤ TJ ≤ 125°C; 3 ≤ VDD ≤ 5.5 V, 4.65
V ≤ VPWR ≤ 25 V; HIPWR = GND, PSEL = GND, GD = VAUX, PCTRL = VAUX, AGND = GND; VAUX, VTX, bypassed with
0.1 µF, DVDD bypassed with 0.22 µF, EN12V = GND and EN9V = GND; all other pins open (unless otherwise noted)
MIN
tFOVPDG
Deglitch for fast over-voltage protection
tOCP
Deglitch Filter for over-current protection
Time power is applied until CC1 and CC2
pull-ups are applied.
tCC
NOM
MAX
UNIT
5
V(VPWR) > V(VPWR_TH) OR
V(VDD) > V(VDD_TH)
2.5
Falling/Rising voltage deglitch time for
detection on CC1 and CC2
µs
15
µs
4
ms
120
µs
Transmitter Specifications (CC1, CC2)
tUI
Bit unit Interval
3.05
Rise/fall time, tFall and tRise (refer to USB
PD in Documentation Support)
External Loading per Figure 25
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
300
3.3
3.70
µs
600
ns
Submit Documentation Feedback
11
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
7.7 Switching Characteristics
Unless otherwise stated in a specific test condition the following conditions apply: –40°C ≤ TJ ≤ 125°C; 3 ≤ VDD ≤ 5.5 V, 4.65
V ≤ VPWR ≤ 25 V; HIPWR = GND, PSEL = GND, GD = VAUX, PCTRL = VAUX, AGND = GND; VAUX, VTX, bypassed with
0.1 µF, DVDD bypassed with 0.22 µF, EN12V = GND and EN9V = GND; all other pins open (unless otherwise noted)
PARAMETER
TEST CONDITIONS
tVP
Delay from enabling external NFET until
under-voltage and OCP protection are
enabled
tSTL
Source settling time, time from CTL1 and
CTL2 being changed until a PS_RDY USB
PD message is transmitted to inform the sink
is may draw full current. (refer to USB PD in
Documentation Support)
tSR
Time that GDNG is disabled after a hard
reset. This is tSrcRecover. (refer to USB PD in
Documentation Support)
tHR
MIN
MAX
UNIT
190
ms
260
ms
765
ms
Time after hard reset is transmitted until
GDNG is disabled. This is tPSHardReset. (refer
to USB PD in Documentation Support)
30
ms
tCCDeb
Time until UFP is pulled low after sink
attachment, this is the USB Type-C required
debounce time for attachment detection
called tCCDebounce. (refer to USB Type-C in
Documentation Support)
185
ms
tST
Delay after sink request is accepted until
CTL1 and/or CTL2 is changed. This is called
tSnkTransition. (refer to USB PD in
Documentation Support)
30
ms
tFLT
The time in between hard reset transmissions GD = GND or VPWR=GND, sink
in the presence of a persistent supply fault.
attached
1395
ms
tSH
The time in between retries (hard reset
transmissions) in the presence of a persistent VBUS = GND, sink attached
VBUS short.
985
ms
tON
The time from UFP being pulled low until a
hard reset is transmitted. Designed to be
greater than tSrcTurnOn. (refer to USB PD in
Documentation Support)
GD = 0 V or VPWR = 0 V
600
ms
Retry interval if USB PD sink stops
communicating without being removed or if
sink does not communicate after a fault
condition. Time GDNG remains enabled
before a hard reset is transmitted. This is the
tNoResponse time. (refer to USB PD in
Documentation Support)
Sink attached
4.8
s
tDVDD
Delay before DVDD is driven high
After sink attached
tGDoff
tFOVP
12
VBUS = GND
TYP
TJ > TJ1
5
ms
Turnoff delay, time until V(GDNG) is below 10%
VGD: 5 V → 0 V in < 0.5 µs.
of its initial value after the GD pin is low.
5
µs
VBUS ↑ to GDNG OFF
Response time when VBUS exceeds the fast(V(GDNG) below 10% its initial
OVP threshold
value)
30
µs
OCP large signal response time
5 A enabled, V(ISNS) -V(VBUS): 0 V
→ 42 mV measured to GDNG
transition start.
30
µs
Time until discharge is stopped after TJ1 is
exceeded.
0 V ≤ V(DSCG) ≤ 25 V
10
µs
Digital output fall time
V(PULLUP) = 1.8 V, CL = 10 pF,
R(PULLUP) = 10 kΩ, V(CTLx) or
V(UFP) : 70% VPULLUP → 30%
VPULLUP
300
ps
Submit Documentation Feedback
20
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
V(FOVP) = 13.76 V
V(SOVP) = 13.4 V
V(SUVP) = 9.45 V
9.45V
PCTRL, and EN9V or EN12V
samples prior to sending
Source Capabilities
tSTL
V(FOVP) = 6.08 V
V(FOVP) = 6.08 V
t STL
V(SOVP) = 5.65 V
V(SOVP) = 5.65 V
V(SUVP) = 3.65V
V(SUVP) = 3.65 V
VBUS
tST
0V
tVP
UFP
SlowOVP/UVP
enabled
OCP
enabled
Sink
Request
Accepted
Sink
Attached
Detected
Figure 1. Timing Illustration for tVP, tST and tSTL, After Sink Attachment negotiation to 12 V then back to 5
V. V(SOVP) and V(SUVP) are Disabled Around Voltage Transitions.
Enabled
tSR
GDNG
tHR
Disabled
UFP
(Pulled high
to DVDD)
Enabled
Disabled
tHR
V(DVDD)
VOL
Figure 2. Timing Illustration for tHR and tSR, After Sink Attachment with persistent TJ > TJ1
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
13
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
Source
Capabilities
Transmitted
Sink
Attached
5V
VBUS
0V
UFP
high-z
(Pulled high
to DVDD)
CC
Voltage
tVP
V(DVDD)
VOL
V(OCDS)
tCcDeb
V(D3.0)
V(DSTD)
Figure 3. Timing Illustration for tCcDeb and tVP, Under Persistent Fault Condition
Enabled
Enabled
tSH
GDNG
tVP
tVP
Disabled
Disabled
V(DVDD)
UFP
(Pulled high
To DVDD)
VOL
Figure 4. Timing Illustration for tSH and tVP, with VBUS Shorted to Ground
Enabled
GDNG
Disabled
UFP
(Pulled high
to DVDD)
V(DVDD)
4.65 V after an unplug
VPWR = 5 V, VDD = 0 V
VPWR = 0 V, VDD = 3.3 V
6.09
6.08
9
V(FOVP) for 5 V (V)
Supply Current (PA)
20
40
60
80
100
Junction Temperature (qC)
6.1
9.5
8.5
8
7.5
7
6.5
6.07
6.06
6.05
6.04
6.03
6
6.02
5.5
6.01
5
-40
0
V(DSCG) = 4 V
10.5
10
-20
D004
-20
0
20
40
60
80
100
Junction Temperature (qC)
120
6
-40
140
-20
0
20
40
60
80
100
Junction Temperature (qC)
D006
Figure 9. Supply Current While CC pins Unattached
120
140
D007
Figure 10. V(FOVP) While Supplying 5 V
13.745
10.56
13.74
10.55
V(FOVP) for 12 V (V)
V(FOVP) for 9 V (V)
13.735
10.54
10.53
10.52
13.73
13.725
13.72
13.715
13.71
10.51
13.705
10.5
-40
-20
0
20
40
60
80
100
Junction Temperature (qC)
120
Figure 11. V(FOVP) While Supplying 9 V
16
Submit Documentation Feedback
140
13.7
-40
-20
0
D008
20
40
60
80
100
Junction Temperature (qC)
120
140
D009
Figure 12. V(FOVP) While Supplying 12 V
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Typical Characteristics (continued)
16.94
23.1
16.935
V(FOVP) for 15 V (V)
16.93
V(FOVP) for 20 V (V)
16.925
16.92
16.915
16.91
16.905
23.05
23
22.95
16.9
16.895
16.89
-40
-20
0
20
40
60
80
100
Junction Temperature (qC)
120
22.9
-40
140
-20
0
D010
Figure 13. V(FOVP) While Supplying 15 V
20
40
60
80
100
Junction Temperature (qC)
120
140
D015
Figure 14. V(FOVP) While Supplying 20 V
21
31.75
20.98
20.96
20.94
31.65
VI(TRIP) (mV)
VI(TRIP) (mV)
31.7
31.6
31.55
20.92
20.9
20.88
20.86
20.84
31.5
20.82
31.45
-40
-20
0
20
40
60
80
100
Junction Temperature (qC)
120
20.8
-40
140
5 A enabled
0
20
40
60
80
100
Junction Temperature (qC)
120
140
D011
3 A enabled
Figure 15. VI(TRIP) When V(VPWR) > 4.65 V
Figure 16. VI(TRIP) When V(VPWR) > 4.65 V
5.5
5.5
VBUS
DVDD
UFP
5
4.5
VBUS
DVDD
UFP
5
4.5
4
4
3.5
3.5
Voltage (V)
Voltage (V)
-20
D016
3
2.5
2
3
2.5
2
1.5
1.5
1
1
0.5
0.5
0
0
0
0.05
0.1
Time (s)
0.15
0.2
-0.5
-0.2
-0.15
-0.1
D012
Sink attached at time 0
UFP pulled up to DVDD
-0.05
0
0.05
Time (s)
0.1
0.15
0.2
0.25
D013
Sink detached at time 0s
Sleep mode entered at time 0.19s.
UFP pulled up to DVDD
Figure 17. DVDD and UFP Upon Sink Attachment
Figure 18. DVDD and UFP Upon Sink Attachment
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
17
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
8 Detailed Description
8.1 Overview
The TPS25740 or TPS25740A and supporting circuits perform the functions required to implement a USB Power
Delivery (PD) 2.0 as a provider-only and a USB Type-C revision 1.2 source. It uses its CC pins to detect the
attachment of a sinking device or upward facing port (UFP) and to determine which of CC1 or CC2 is connected
to the CC wire of the cable. It then communicates over the CC wire in the cable bundle using USB PD to offer a
set of voltages and currents. USB PD is a technology that utilizes the ubiquitous USB communications and
hardware infrastructure to extend the amount of power available to devices from the 7.5 W range for USB BC1.2
to as high as 100 W in a dock. It is a compatible overlay to USB 2.0 and USB 3.0, coexisting with the existing 5
V powered universe of devices by use of adapter cables. Some basic characteristics of this technology relevant
to the device include:
• Increased power achieved by providing higher current and/or higher voltage.
• New 3 A cable and 5 A connector to support greater than the traditional 1.5 A.
– Cables have controlled voltage drop
• Voltages greater than 5 V are negotiated between PD partners.
– Standard 5 V is always the default source voltage.
– Voltage and current provisions are negotiated between PD partners.
• PD partners negotiate over the CC line to avoid conflict with existing signaling (that is, D+, D-)
• Layered communication protocol defined including PHY, Protocol Layer, Policy Engine, and Device Policy
Manager all implemented within the device.
• The Type-C connector standard implements pre-powerup signaling to determine:
– Connector orientation
– Source 5-V capability
– Detect through connection of a UFP (upward facing port) to a DFP (downward facing port).
– Detection of when the connected UFP is disconnected. VBUS is unpowered until a through-connection is
present
Figure 19 and Figure 20 show a typical configuration for the device.
RS
VBUS
R(DSCG)
CC1
CC2
GD
UFP
Port Status
Indicator
C(DVDD)
C(VAUX)
C(VTX)
VTX
PCTRL
VAUX
HIPWR
DVDD
TPS25740
TPS25740A
CTL1
CTL2
PSEL
EN12V / EN9V
GND
AGND
VDD
R(SEL)
Type-C
receptacle
C(RX)
DSCG
VBUS
ISNS
GDNS
GDNS
VPWR
C(SLEW) R(SLEW)
C(SOURCE)
Power Supply
10Ÿ
10Ÿ
Voltage Selector (eg. Secondary
voltage in fly-back topology)
C(PDIN)
Output voltage from power supply
C(RX)
CSD17578Q3A (2x)
Copyright © 2016, Texas Instruments Incorporated
Figure 19. Schematic 1
18
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Overview (continued)
CSD17579Q3A (1x)
RS
VBUS
Output voltage from power supply
C(RX)
VBUS
DSCG
ISNS
GD
UFP
Port Status
Indicator
C(DVDD)
C(VAUX)
C(VTX)
VTX
PCTRL
VAUX
HIPWR
R(SEL)
DVDD
TPS25740
TPS25740A
CTL1
CTL2
CC1
CC2
PSEL
EN12V / EN9V
GND
AGND
VDD
Voltage selector (eg. Secondary
voltage in fly-back topology)
Type-C
Plug
C(PDIN)
R(DSCG)
C(SLEW) R(SLEW)
GDNS
GDNG
VPWR
Power Supply
C(SOURCE)
10Ÿ
Copyright © 2016, Texas Instruments Incorporated
Figure 20. Schematic 2
8.1.1 VBUS Capacitance
The USB Type-C specification requires that the capacitance on the VBUS pin of an empty receptacle be below
10 µF. This is to protect legacy USB sources that are not designed to handle the larger inrush capacitance and
which may be connected via an A-to-C cable. For applications with USB Type-C receptacles and large bulk
capacitance, this means back-to-back blocking FETs are required as shown in Figure 19. However, for
applications with a USB Type-C plug (that is, a captive cable) this requirement does not apply since an adaptor
cable with a USB Type-C receptacle and a Type-A plug is not defined or allowed by the USB I/F. Figure 20 is a
schematic for such applications.
8.1.2 USB Data Communications
The USB Power Delivery specification requires that sources such as the device advertise in the source
capabilities messages they transmit whether or not they are in a product that supports USB data
communications. The device is designed for systems without data communication, so it has this bit hard-coded to
0.
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
19
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
8.2 Functional Block Diagram
HIPWR
PSEL
VBUS
VDD
AGND
GND
VPWR
VTX
DVDD
VAUX
Power Mgmt
Internal
Power
Rails
CC
Logic
EN12V
EN9V
Monitor
OVP, OCP
Digital
Control Logic
PCTRL
CC1
USB PD
Modem
Configuration
Inputs
Analog Drivers
Power
Inputs
ISNS
GD
Power
Path
Override
GDNS
GDNG
DSCG
HV
Analog
Drivers
CC2
Type- C
Interface
CTL1
CTL2
UFP
COMP
Oscillator
Digital
Outputs
Copyright © 2016, Texas Instruments Incorporated
8.3 Feature Description
This section describes the features associated with each pin for the TPS25740 and TPS25740A.
8.3.1 USB Type-C CC Logic (CC1, CC2)
The device uses a current source to implement the pull up resistance USB Type-C requires for Sources. While
waiting for a valid connection, the device applies a default pullup of I(RPSTD). A sink attachment is detected when
the voltage on one (not both) of the CC pins remains between V(RDSTD) and V(DSTD) for tCcDeb and the voltage on
the VBUS pin is below V(VBUS_FTH). Then after turning on VBUS and disabling the Rp current source for the CCx
pin not connected through the cable, the device applies I(RP3.0) to advertise 3 A to non-PD sinks. Finally, if it is
determined that the attached sink is PD-capable, the device applies I(RP1.5). During this sequence if the voltage
on the monitored CC pin exceeds the detach threshold then the device removes VBUS and begins watching for
a sink attachment again.
The TPS25740 or TPS25740A digital logic selects the current source switch as illustrated in Figure 21. The
schematic shown is replicated for each CC pin.
20
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Feature Description (continued)
V(D3.0)
Digital Control Logic
V(D1.5)
I(RPSTD)
V(DSTD)
I(RP1.5)
I(RP3.0)
V(RD3.0)
CCx
V(RD1.5)
Digital Control Logic
V(RDSTD)
Figure 21. USB Type-C Rp Current Sources and Detection Comparators
If the voltage on both CC pins remains above V(RDSTD) for tCcDeb, then the TPS25740 or TPS25740A goes to the
sleep mode. In the sleep mode a less accurate current source is applied and a less accurate comparator
watches for attachment (see V(WAKE), and I(DSDFP)).
8.3.2 USB PD BMC Transmission (CC1, CC2, VTX)
An example of the BMC signal, specifically the end of the preamble and beginning of start-of-packet (SOP) is
shown below. There is always an edge at the end of each bit or unit interval, and ones have an edge half way
through the unit interval.
Preamble
0
1
0
1
0
SOP.Sync2
SOP.Sync1
1
0
1
0
0
0
1
1
0
0
0
1
1
Data in
BMC
Figure 22. BMC Encoded End of Preamble, Beginning of SOP
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
21
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
Feature Description (continued)
While engaging in USB PD communications, the TPS25740 or TPS25740A is applying I(RP1.5) or I(RP3.0), so the
CC line has a DC voltage of 0.918 V or 1.68 V, respectively. When the BMC signal is transmitted on the CC line,
the transmitter overrides this DC voltage as shown in Figure 23. The transmitter bias rail (VTX) is internally
generated and may not be used for any other purpose in the system. The VTX pin is only high while the
TPS25740 or TPS25740A is transmitting a USB PD message.
VTXHI
DC Bias
DC Bias
VTXLO
VTXHI
DC Bias
DC Bias
VTXLO
Figure 23. USB PD BMC Transmission on the CC Line
The device transmissions meet the eye diagram USB PD requirements (refer to USB PD in Documentation
Support) across the recommended temperature range. Figure 24 shows the transmitter schematic.
To Receiver
CC1
RTX
Driver
CC2
ZDRIVER
Digital Control
Logic
Copyright © 2016, Texas Instruments Incorporated
Figure 24. USB PD BMC Transmitter Schematic
The transmit eye diagram shown in Figure 26 was measured using the test load shown in Figure 25 with a CLOAD
within the allowed range. The total capacitance CLOAD is computed as:
CLOAD = C(RX) + CCablePlug x 2 + Ca + CReceiver
(1)
Where:
• 200 pF < C(RX) < 600 pF
• CCablePlug < 25 pF
• Ca < 625 pF
• 200 pF < CReceiver < 600 pF
Therefore, 400 pF < CLOAD < 1850 pF.
22
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Feature Description (continued)
CCx
5.1NŸ
CLOAD
GND
Copyright © 2016, Texas Instruments Incorporated
Figure 25. Test Load for BMC Transmitter
Figure 26 shows the transmit eye diagram for the TPS25740 and TPS25740A.
Figure 26. Transmit Eye Diagram (BMC)
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
23
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
Feature Description (continued)
8.3.3 USB PD BMC Reception (CC1, CC2)
The TPS25740 or TPS25740A BMC receiver follows the USB PD requirements (refer to USB PD in
Documentation Support) using the schematic shown in Figure 27.
The device low-pass filter design and receiver threshold design allows it to reject interference that may couple
onto the CC line from a noisy VBUS power supply or any other source (refer to V(INT)).
To Transmitter
V(RXHI)
Digital Control Logic
CC1
Low-Pass Filter
CC2
Digital Control
Logic
V(RXLO)
Copyright © 2016, Texas Instruments Incorporated
Figure 27. USB PD BMC Receiver Schematic
8.3.4 Discharging (DSCG, VPWR)
The DSCG pin allows for two different pull-downs that are used to apply different discharging strengths. In
addition, the VPWR pin is used to apply a load to discharge the power supply bulk capacitance.
If too much power is dissipated by the device (that is, the TJ1 temperature is exceeded) an OTSD occurs that
disables the discharge FET; therefore, an external resistor is recommended in series with the DSCG pin to
absorb most of the dissipated power. The external resistor R(DSCG) should be chosen such that the current sunk
by the DSCG pin does not exceed I(DSCGT).
The VPWR pin should always be connected to the supply side (as opposed to the connector side) of the powerpath switch (Figure 28 shows one example). This pin is monitored before enabling the GDNG gate driver to apply
the voltage to the VBUS pin of the connector.
From sink attachment, and while the device has not finalized a USB PD contract, the device applies R(DSCGB).
Also from sink attachment, and while the device has not finalized a USB PD contract, the device draws I(SUPP)
through the VPWR pin even if VDD is above its UVLO. This helps to discharge the power supply source.
24
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Feature Description (continued)
Power Supply
VBUS
DSCG
R(DSCG)
GDNS
GDNG
VPWR
C(SLEW)
R(SLEW)
10Ÿ
DSCG
Control
See I(DSCGT) and V(DSCGT)
R(DSCGB)
Copyright © 2016, Texas Instruments Incorporated
Figure 28. Discharge Schematic
The discharge procedure used in the TPS25740 or TPS25740A is intended to allow the DSCG pin to help pull
the power supply down from high voltage, and then also pull VBUS at the connector down to the required level
(refer to USB PD in Documentation Support).
8.3.4.1 Discharging after a Fault (VPWR)
There are two types of faults that cause the TPS25740 or TPS25740A to begin a full discharge of VBUS: Slowshutdown faults and fast-shutdown faults. When a slow-shutdown fault occurs, the device does not disable
GDNG until after VBUS is measured below V(SOVP) for a 5V contract. When a fast-shutdown fault occurs, the
device disables GDNG immediately and then discharges the connector side of the power-path. In both cases, the
bleed discharge is applied to the DSCG pin and I(SUPP) is drawn from the VPWR
Slow-shutdown faults that do not include transmitting a hard reset:
• Receiving a Hard Reset signal (25 ms < tShutdownDelay < 35 ms)
• Cable is unplugged (tShutdownDelay < 20 µs)
Slow-shutdown faults that include transmitting hard reset (25 ms < tShutdownDelay < 35 ms)
• TJ exceeds TJ1 (an overtemperature event)
• Low voltage alarm occurring outside of a voltage transition
• High voltage alarm occurring outside of a voltage transition (but not high enough to cause OVP)
• Receiving an unexpected PD message during a voltage transition
• Failure of power supply to transition voltages within required time of 600 ms (tPSTransition (refer to USB PD in
Documentation Support).
• A Soft Reset USB PD message is not acknowledged or Accepted (refer to USB PD in Documentation
Support).
• A Request USB PD message is not received in the required time (refer to USB PD in Documentation
Support).
• Failure to discharge down to 0.725 V after a fault of any kind.
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
25
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
Feature Description (continued)
Fast-shutdown faults (hard reset always sent):
• Fast OVP event occurring at any time.
• OCP event occurring at any time starting from the transmission of the first USB PD message.
– VBUS falling below V(VBUS_FTH) is treated as an OCP event.
• GD falling edge
The DSCG pin is used to discharge the supply line after a slow-shutdown fault occurs. Figure 29 illustrates the
signals involved. Depending on the specific slow-shutdown fault the time tShutdownDelay in Figure 29 is different as
indicated in the list above. If the slow-shutdown fault triggers a hard reset, it is sent at the beginning of the
tShutdownDelay period. However, the device behavior after the time tShutdownDelay is the same for all slow-shutdown
faults. After the tShutdownDelay period, the device sets CTL1 and CTL2 to select 5 V from the power supply and puts
the DSCG pin into its ON state (Full Discharge). This discharging continues until the voltage on the VBUS pin
reaches V(SOVP) for a 5-V contract. The device then disables GDNG and again puts the DSCG pin into its ON
state. This discharging state lasts until the voltage on VBUS reaches 0.725 V (nominal). If the discharge does not
complete within 650 ms, then the device sends a Hard Reset signal and the process repeats. In Figure 29, the
times labeled as t20→5 and t5→0 can vary, they depend on the size of the capacitance to be discharged and the
size of the external resistor between the DSCG pin and VBUS. The time labeled as tS is a function of how quickly
the NFET opens.
20 V
5V
VPWR
20 V
5V
VBUS
< 0.8V
NFET enabled (closed)
NFET disabled (open)
GDNG
tS
Bleed
only
Full
discharge
DSCG
t20:5
t5:0
High-z
CTL1 and CTL2
Low
tShutdownDelay
Time bounded by 650 ms
(tSafe0V)
SlowShutdown
Fault occurs
Figure 29. Illustration of Slow-Shutdown VBUS Discharge
Figure 30 illustrates a similar discharge procedure for fast-shutdown faults. The main difference from Figure 29 is
that the NFET is opened immediately. It is assumed for the purposes of this illustration that the power supply
output capacitance (that is, C(SOURCE) in the reference schematics shown in Figure 19 and Figure 20) is not
discharged by the power supply itself, but the VPWR pin is bleeding current from that capacitance. The VPWR
pin then draws I(SUPP) after GDNG disables the external NFET. So, as shown in the figure, the VPWR voltage
discharges slowly, while the VBUS pin is discharged once the full discharge is enabled. If the voltage on the
VPWR pin takes longer than t20→5 + t5→0 + 0.765s to discharge below V(FOVP), then it causes an OVP event and
the process repeats.
26
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Feature Description (continued)
20 V
5V
VPWR
20 V
5V
VBUS
< 0. 8 V
NFET closed
NFET open
GDNG
tS
Bleed
only
Full
dishcharge
DSCG
t20:5
t5:0
High-z
Low
CTL1 and CTL2
tPSHardReset
FastShutdown
Fault occurs
Time bounded by 650 ms
(tSafe0V)
Hard
Reset
Sent
Figure 30. Illustration of Fast-Shutdown Discharge
If the discharge does not complete successfully it is treated as a slow-shutdown fault, and the TPS25740 or
TPS25740A repeats the discharge procedure until it does complete successfully. Once the discharge completes
successfully as described above (that is, VBUS on connector is below 0.725 V), the device waits for 0.765 s
(nominal) before trying to source VBUS again.
8.3.5 Configuring Voltage Capabilities (HIPWR, EN9V, EN12V)
The voltages advertised to USB PD-capable sinks can be configured to one of four different sets. The EN9V, or
EN12V pin is not envisioned to be changed dynamically in the system, so changing its state does not trigger
sending source capabilities. However, the TPS25740A checks the status of the pin each time before it sends a
source capabilities message using USB PD. Note that changing the state of the PCTRL pin forces capabilities to
be re-transmitted. The device reads the HIPWR pin after a reset and latches the result.
Table 1. Voltage Programming (TPS25740)
EN12V PIN
HIPWR PIN
VOLTAGES ADVERTISED via USB PD [V]
Low
Connected to DVDD or GND directly
5, 12, 20
Low
Connected to DVDD or GND via R(SEL)
5, 12
High
Connected to DVDD or GND directly
5, 20
High
Connected to DVDD or GND via R(SEL)
5
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
27
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
Table 2. Voltage Programming (TPS25740A)
EN9V PIN
HIPWR PIN
VOLTAGES ADVERTISED via USB PD [V]
Low
Connected to DVDD or GND directly
5, 9, 15
Low
Connected to DVDD or GND via R(SEL)
5, 9
High
Connected to DVDD or GND directly
5, 15
High
Connected to DVDD or GND via R(SEL)
5
8.3.6 Configuring Power Capabilities (PSEL, PCTRL, HIPWR)
The power advertised to non-PD Type-C Sinks is always 15 W. However, the TPS25740 or TPS25740A only
advertises Type-C default current until it debounces the Sink attachment for tCcDeb and the VBUS voltage has
been given tVP to stabilize.
The device does not communicate with the cable to determine its capabilities. Therefore, unless the device is in
a system with a captive cable able to support 5 A, the HIPWR pin should be used to limit the advertised current
to 3 A.
PCTRL is an input pin used to control how much of the maximum allowed power the port will advertise. This pin
may be changed dynamically in the system and the device automatically updates any existing USB PD contract.
If the PCTRL pin is pulled below V(PCTRL_TH), then the source capabilities offers half of the maximum power
specified by the PSEL pin.
The devices read the PSEL and HIPWR pins after a reset and latches the result, but the PCTRL pin is read
dynamically by the device and if its state changes new capabilities are calculated and then transmitted.
While USB PD allows advertising a power of 100 W, UL certification for Class 2 power units (UL 1310) requires
the maximum power remain below 100 W. The TPS25740 only advertises up to 4.65 A for a 20-V contract, this
allows the VBUS overshoot to reach 21.5 V as allowed by USB PD while remaining within the UL certification
limits. Therefore, the TPS25740 allows delivering 100 W of power without adding additional voltage tolerance
constraints on the power supply.
The PSEL pin offers four possible maximum power settings, but the devices can actually advertise more power
settings depending upon the state of the HIPWR and PCTRL pins. Table 3 summarizes the four maximum power
settings that are available via PSEL, again note this is not necessarily the maximum power that is advertised.
Table 3. PSEL Configurations
Maximum Power
(PSEL) [W]
PSEL
P(SEL) = 36
Direct to GND
P(SEL) = 45
DVDD via R(SEL)
P(SEL)= 65
GND via R(SEL)
P(SEL) = 93
Direct to DVDD
Equation 2 provides a quick reference which applies to both TPS25740 and TPS25740A to see how the HIPWR,
PSEL and PCTRL pins affect what current is advertised with each voltage in the source capabilities message:
Ix
§ P max
·
min ¨
, Im ax ¸
© Vm ax
¹
(2)
Where:
• For a voltage Vx, the advertised current is Ix
• If the PCTRL pin is low, then Pmax = P(SEL) / 2
• If the PCTRL pin is high, then Pmax = P(SEL).
• If the HIPWR pin is pulled high, then Imax = 3 A.
• If the HIPWR pin is pulled low, then Imax = 5 A.
Table 4 and Table 5 provide a comprehensive list of the currents and voltages that are advertised for each
voltage.
28
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Table 4. Maximum Current Advertised in the Power Data Object for a Given Voltage (TPS25740)
PSEL
VOLTAGE [V]
HIPWR
Direct to GND
DVDD via R(SEL)
GND via R(SEL)
5
Max = 3 A
DVDD through
R(SEL) or Direct to
DVDD
Direct to DVDD
Direct to GND
DVDD via R(SEL)
GND via R(SEL)
12
MAXIMUM CURRENT
PCTRL = LOW [A]
MAXIMUM CURRENT
PCTRL = HIGH [A]
3
3
3
3
3
3
3
3
1.5
3
1.87
3
2.7
3
Direct to DVDD
3
3
Direct to GND
0.9
1.8
1.12
2.24
1.62
3
Direct to DVDD
2.32
3
Direct to GND
3.6
5
DVDD via R(SEL)
4.5
5
5
5
5
5
1.5
3
1.87
3.74
2.7
5
DVDD via R(SEL)
GND via R(SEL)
GND via R(SEL)
20
5
Max = 5 A
GND through
R(SEL) or Direct to
GND
Direct to DVDD
Direct to GND
DVDD via R(SEL)
GND via R(SEL)
Max = 3 A
Direct to DVDD
12
Direct to DVDD
4.16
5
Direct to GND
0.9
1.8
1.12
2.24
1.62
3.24
2.32
4.64
DVDD via R(SEL)
GND via R(SEL)
20
Max = 5 A
Direct to GND
Direct to DVDD
Table 5. Maximum Current Advertised in the Power Data Object for a Given Voltage (TPS25740A)
MAXIMUM CURRENT
PCTRL = LOW [A]
MAXIMUM CURRENT
PCTRL = HIGH [A]
Direct to GND
3
3
DVDD via R(SEL)
3
3
3
3
3
3
2
3
2.5
3
3
3
3
3
1.2
2.4
1.5
3
2.17
3
3
3
PSEL
GND via R(SEL)
VOLTAGE [V]
5
Max = 3 A
DVDD through
R(SEL) or Direct to
DVDD
Direct to DVDD
Direct to GND
DVDD via R(SEL)
GND via R(SEL)
HIPWR
9
Direct to DVDD
Direct to GND
DVDD via R(SEL)
GND viaR(SEL)
15
Max = 3 A
Direct to DVDD
Direct to DVDD
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
29
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
Table 5. Maximum Current Advertised in the Power Data Object for a Given Voltage
(TPS25740A) (continued)
PSEL
VOLTAGE [V]
HIPWR
MAXIMUM CURRENT
PCTRL = LOW [A]
MAXIMUM CURRENT
PCTRL = HIGH [A]
3.6
5
4.5
5
5
5
5
5
Direct to GND
DVDD via R(SEL)
GND via R(SEL)
5
Max = 5 A
GND through
R(SEL) or Direct to
GND
Direct to DVDD
Direct to GND
DVDD via R(SEL)
GND via R(SEL)
9
2
4
2.5
5
3.61
5
Direct to DVDD
5
5
Direct to GND
1.2
2.4
DVDD via R(SEL)
GND via R(SEL)
Max = 5 A
Direct to GND
15
Direct to DVDD
1.5
3
2.17
4.34
3.1
5
8.3.7 Gate Driver (GDNG, GDNS)
The GDNG and GDNS pins may control a single NFET or back-to-back NFETs in a common-source
configuration. The GDNS is used to sense the voltage so that the voltage differential between the pins is
maintained.
VBUS
Power Supply
Power
Management
C(SLEW) R(SLEW)
GDNS
Safety
Turnoff
GDNG
10 :
R(GDNGOFF)
Charge
Pump
Gate Control
Copyright © 2016, Texas Instruments Incorporated
Figure 31. GDNG/GDNS Gate Control
30
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
8.3.8 Fault Monitoring and Protection
8.3.8.1 Over/Under Voltage (VBUS)
The TPS25740 or TPS25740A uses the VBUS pin to monitor for overvoltage or undervoltage conditions and
implement the fast-OVP, slow-OVP and slow-UVP features.
VBUS
VBUS
V(FOVP)
Deglitch
tFOVPDG
GDNG
Control
V(SOVP)
Sampled every 1ms
Send Hard
Reset
Sampled every 1ms
Send Hard
Reset
V(SUVP)
Copyright © 2016, Texas Instruments Incorporated
Figure 32. Voltage Monitoring Circuits
If an over-voltage condition is sensed by the Fast OVP mechanism, GDNG is disabled within tFOVP + tFOVPDG,
then a Hard Reset is transmitted and the VBUS discharge sequence is started. At power up the voltage trip point
is set to V(FOVP) (5 V contract). When a contract is negotiated the trip point is set to the corresponding V(FOVP)
value.
The devices employ another slow over-voltage protection mechanism as well that sends the Hard Reset before
disabling the external NFET. It catches many OV events before the Fast OVP mechanism. During intentional
positive voltage transitions, this mechanism is disabled (see Figure 1). However, tVP after the external NFET has
been enabled, if the voltage on the VBUS pin exceeds V(SOVP) then a Hard Reset is transmitted to the Sink and
the VBUS discharge sequence is started.
The devices employ a slow under-voltage protection mechanism as well that sends the Hard Reset before
disabling GDNG. During intentional negative voltage transitions, this mechanism is disabled (see Figure 1).
However, tVP after the external NFET has been enabled if the voltage on the VBUS pin falls below V(SUVP), then a
Hard Reset is transmitted to the Sink and the VBUS discharge sequence is started.
8.3.8.2 Over-Current Protection (ISNS, VBUS)
OCP protection is enabled tVP after the voltage on the VBUS pin has exceeded V(VBUS_RTH). Prior to OCP being
enabled, the GD pin can be used to protect against a short.
The OCP protection circuit monitors the differential voltage across an external sense resistor to detect when the
current outflow exceeds VI(TRIP) which in turn activates an over-current circuit breaker and disables the GDNG /
GDNS gate driver. Once the OCP is enabled, if the voltage on the VBUS pin falls below V(VBUS_FTH) then that is
also treated like an OCP event.
Following the recommended implementation of a 5-mΩ sense resistor, when the device is configured to deliver 3
A (via HIPWR pin), the OCP threshold lies between 3.8 A and 4.5 A. When configured to deliver 5 A (via HIPWR
pin), the OCP threshold lies between 5.8 A and 6.8 A. The resistance of the sense resistor may be tuned to
adjust the current that causes VI(TRIP) to be exceeded.
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
31
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
RS
Power Supply
VBUS
VBUS
ISNS
V(VBUS_TH)
+
-
VI(TRIP)
+
GDNG
Control
+
Deglitch
-
tOCP
Enable OCP
Copyright © 2016, Texas Instruments Incorporated
Figure 33. Overcurrent Protection Circuit, (ISNS, VBUS)
8.3.8.3 System Fault Input (GD, VPWR)
The gate-driver disable pin provides a method of overriding the internal control of GDNG and GDNS. A falling
edge on GD disables the gate driver within tGDoff. If GD is held low after a sink is attached for 600 ms then a hard
reset will be generated and the device sends a hard reset and go through its startup process again.
The GD input can be controlled by a voltage or current source. An internal voltage clamp is provided to limit the
input voltage in current source applications. The clamp can safely conduct up to 80 µA and will remain high
impedance up to 6.5 V before clamping
GDNG
GD
Control
V(GD_TH)
R(GD)
Deglitch
tGDoff
V(GDC)
Copyright © 2016, Texas Instruments Incorporated
Figure 34. Overcurrent Protection Circuit, (GD)
If the VPWR pin remains below its falling UVLO threshold (V(VPWR_TH)) for more than 600 ms after a sink is
attached then the devices consider it a fault and will not enable GDNG. If the VPWR pin is between the rising
and falling UVLO threshold, the TPS25740/TPS25740A may enable GDNG and proceed with normal operations.
However, after GDNG is enabled, if the VBUS pin does not rise above its UVLO within 190 ms the devices
consider it a fast-shutdown fault and disables GDNG. Therefore, in order to ensure USB Type-C compliance and
normal operation, the VPWR pin must be above its rising UVLO threshold (V(VPWR_TH)) within 275 ms of when
UFP is pulled low and the VBUS pin must be above V(VBUS_RTH) within 190 ms of GDNG being enabled.
32
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
8.3.9 Voltage Control (CTL1, CTL2)
CTL1 and CTL2 are open-drain output pins used to control an external power supply as summarized in Table 6.
Depending upon the voltage requested by the sink, the device sets the CTL pins accordingly. No current flows
into the pin in its high-z state.
Table 6. States of CTL1 and CTL2 as a Function of Target Voltage on VBUS for TPS25740
VOLTAGE CONTAINED in PDO
REQUESTED by UFP
CTL2 STATE
CTL1 STATE
5V
High-z
High-z
9 V (TPS25740A)
Low
High-z
12 V (TPS25740)
Low
High-z
15 V (TPS25740A)
Low
Low
20 V (TPS25740)
Low
Low
8.3.10 Sink Attachment Indicator (UFP, DVDD)
UFP is an open-drain output pin used to indicate the status of the port. It is high-z unless a sink is attached to the
port, in which case it is pulled low. A sink attachment is detected when the voltage on one (not both) of the CC
pins remains between V(RDSTD) and V(DSTD) for tCcDeb and the voltage on the VBUS pin is below V(VBUS_FTH). After
being pulled low, UFP remains low until the sink has been removed for tCcDeb.
DVDD is a power supply pin that is high-z until a sink or debug accessory or audio accessory is attached, in
which case it is pulled high. Therefore, it can be used as a sink attachment indicator that is active high.
8.3.11 Power Supplies (VAUX, VDD, VPWR, DVDD)
The VAUX pin is the output of a linear regulator and the input supply for internal power management circuitry.
The VAUX regulator draws power from VDD after establishing a USB PD contract unless it is not available in
which case it draws from VPWR. Changes in supply voltages will result in seamless switching between supplies.
If there is a load on the DVDD pin, that current will be drawn from the VPWR pin unless the device has stabilized
into a USB PD contract or VPWR is below its UVLO.
The device cannot function properly until VPWR is above its UVLO. However, for improved system efficiency
when UFP is high-z, VPWR can be low (the high voltage power supply can be disabled) if VDD is above its
UVLO.
Connect VAUX to GND via the recommended bypass capacitor. Do not connect any external load that draws
more than I(VAUXEXT). Locate the bypass capacitor close to the pin and provide a low impedance ground
connection from the capacitor to the ground plane.
VDD should either be grounded or be fed by a low impedance path and have input bypass capacitance. Locate
the bypass capacitors close to the VDD and VPWR pins and provide a low impedance ground connection from
the capacitor to the ground plane.
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
33
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
VPWR
VDD
Power Supply
VAUX
0.1…F
Power Management
DVDD
0.22…F
Copyright © 2016, Texas Instruments Incorporated
Figure 35. Power Management
8.3.12 Grounds (AGND, GND)
GND is the substrate ground of the die. Most circuits return to GND, but certain analog circuitry returns to AGND
to reduce noise and offsets. The power pad (on those devices that possess one) is electrically connected to
GND. Connect AGND, GND and the power pad (if present) to the ground plane through the shortest and most
direct connections possible.
8.3.13 Output Power Supply (DVDD)
The DVDD pin is the output of an internal 1.85 V linear regulator, and the input supply for internal digital circuitry.
This regulator normally draws power from VPWR until a USB PD contract has stabilized, but will seamlessly
swap to drawing power from VDD in the event that VPWR drops below its UVLO threshold. External circuitry can
draw up to 35 mA from DVDD. Note that as more power is drawn from the DVDD pin more heat is dissipated in
the device, and if excessive the OTSD could be tripped which resets the device. Connect DVDD to GND via the
recommended ceramic bypass capacitor.
The DVDD pin will only be high when a USB Type-C sink, or audio accessory, or debug accessory is attached,
refer to Figure 17 and Figure 18.
Locate the bypass capacitor close to the pin and provide a low impedance ground connection from the capacitor
to the ground plane.
34
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
8.4 Device Functional Modes
8.4.1 Sleep Mode
Many adaptors that include USB PD must consume low quiescent power to meet regulatory requirements (that
is, “Green,” Energy Star, or such). The device supports the sleep mode to minimize power consumption when the
receptacle or plug is unattached. The device enters sleep mode when there is no valid plug termination attached;
a valid plug termination is defined as one of: sink, Audio accessory, or Debug accessory. If an active cable is
attached but its far-end is left unconnected or “dangling,” then the device also enters sleep mode. It exits the
sleep mode whenever the plug status changes, that could be a dangling cable being removed or a sink being
connected.
8.4.2 Checking VBUS at Start Up
When first powered up, the device will not enable GDNG if the voltage on VBUS is already above its UVLO. This
is a protective measure taken to avoid the possibility of turning on while connected to another active power
supply in some non-compliant configuration.
This means that the VBUS pin must be connected between the power-path NFET and the USB connector. This
also allows for a controlled discharge of VBUS all the way down to the required voltage on the connector (refer to
USB PD in Documentation Support).
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
35
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The TPS25740 or TPS25740A implements a fully compliant USB Power Delivery 2.0 provider and Type-C
source (also known as downward facing port (DFP)). The device basic schematic diagram is shown in Figure 36.
Subsequent sections describe detailed design procedures for several applications with differing requirements.
The TPS25740/TPS25740A Design Calculator Tool (refer to the Documentation Support) is available for
download and use in calculating the equations in the following sections.
CSD17579Q3A
5mŸ
B340A-13-F
VBUS
6.8 PF
Type-C
Plug
560 pf
DSC G
V BUS
ISN S
GDNS
G DN G
0.33 µF
V PW R
Power
Supply
System
0.1 PF
10 nF
1 k:
D-
120 :
10 :
24.9 :
D+
VDD
CC1
CTL1
CC2
TPS25740
PSEL
EN 12V
G ND
AG ND
100 k:
H IPWR
0.22 PF
DVDD
GD
0.1 PF
220 k:
0.1 PF
PCTRL
V TX
UFP
VAUX
CTL2
Copyright © 2016, Texas Instruments Incorporated
Figure 36. Basic Schematic Diagram (P(SEL) = 65 W at 5 V, 12 V, 20 V)
9.1.1 System-Level ESD Protection
System-level ESD (per EN61000-4-2) may occur as the result of a cable being plugged in, or a user touching the
USB connector or cable. Figure 37 shows an example ESD protection for the VBUS path that helps protect the
VBUS pin, ISNS and DSCG pins of the device from system-level ESD. The device has ESD protection built into
the CC1 and CC2 pins so that no external protection is necessary. Refer to the Layout Guidelines section for
external component placement and routing recommendations.
The Schottky diode is to protect against VBUS being drawn below ground by an inductive load, the cable
inductance may be as high as 900 nH.
36
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Application Information (continued)
VBUS
RS
Type-C
Plug/
Receptacle
ISNS
VBUS
DSCG
R(DSCG)
C(PDIN)
D(VBUS)
TPS25740
TPS25740A
Copyright © 2016, Texas Instruments Incorporated
Figure 37. VBUS ESD Protection
9.1.2
Use of GD Internal Clamp
As described in the Configuring Power Capabilities (PSEL, PCTRL, HIPWR) section, the GD pin has an internal
clamp. Figure 38 shows an example of how it may be used. VOUT is the voltage from a power supply that is to be
provided onto the VBUS wire of the USB Type-C cable through an NFET resistor. If VOUT drops, the NFET
should be automatically disabled by the device. This can be accomplished by tying the GD pin to VOUT via a
resistor.
The internal resistance of the GD pin is specified to exceed R(GD), and the input threshold is V(GD_TH). The GD pin
would therefore draw no more than V(GD_TH) max / R(GD) min < 603 nA. As an example, assume the minimum value
of VOUT for which GD should be high is 4.5 V, then the resistor between GD and VOUT may not exceed (4.5 –
V(GD_TH) max) / 603e-9 = 4.5 MΩ. To make it robust against board leakage a smaller resistor such as 1 MΩ can be
chosen, but the smaller the resistance the more leakage current into the GD pin. In this example, when VOUT is
25 V, the current into the GD pin is (25-V(GDC)) / 1e6 < 1.85 µA.
CSD17579Q3A
VBUS
R(DSCG)
RS
GD
C(RX)
DSCG
VBUS
ISNS
GDNS
VPWR
GDNG
C(SLEW)
10Ÿ
R(SLEW)
RG
Type-C Plug
C(PDIN)
VOUT
CC1
CC2
TPS25740
TPS25740A
Copyright © 2016, Texas Instruments Incorporated
Figure 38. Use of GD Internal Clamp
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
37
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
Application Information (continued)
9.1.3 Resistor Divider on GD for Programmable Start Up
Figure 39 shows an alternative usage of the GD pin can help protect against shorts on the VBUS pin in the
receptacle. A resistor divider is used to minimize the time it takes the GD pin to be pulled low. Consider the
situation where the VBUS pin is shorted at startup. At some point, the device closes the NFET switch to supply 5
V to VBUS. At that point, the short pulls down on the voltage seen at the VPWR pin. With the resistor values
shown in Figure 39, once the voltage at the VPWR pin reaches 3.95 V the voltage at the GD pin is specified to
be below V(GD_TH) min. Without the 700-kΩ resistor, the voltage at the VPWR pin would have to reach V(GD_TH) min
which takes longer. This comes at the expense of increased leakage current.
CSD17579Q3A
VBUS
R(DSCG)
RS
GD
C(RX)
DSCG
VBUS
ISNS
GDNS
GDNG
VPWR
R(GD1)
10Ÿ
C(SLEW)
R(SLEW)
RG
Type-C Plug
C(PDIN)
VOUT
CC1
CC2
R(GD2)
700NŸ
TPS25740
TPS25740A
Copyright © 2016, Texas Instruments Incorporated
Figure 39. Programmable GD Turn On
The GD resistor values can be calculated using the following process. First, calculate the smallest R(GD1) that
should be used to prevent the internal clamp current from exceeding I(GD) of 80 µA. For a 20 V advertised
voltage, the OVP trip point could be as high as 24 V. Using V(GDC) min = 6.5 V and VOUT = V(FOVP20) max = 24 V,
provides Equation 3:
R(GD1) !
V(FOVP20)
V(GDC)
I(GD)
24 V 6.5 V
80 $
219 k
(3)
The actual clamping current is less than 80 µA as some current flows into R(GD2). Next, R(GD2) can be calculated
as shown in Equation 4:
R(GD2) R(GD1) u
V(GD_TH)
V(VPWR)
V(GD_TH)
where
•
V(VPWR) = V(VPWR_TH) falling (max) and V(GD_TH) = V(GD_TH) falling (min).
(4)
9.1.4 Selection of the CTL1 and CTL2 Resistors (R(FBL1) and R(FBL2))
R(FBL1) and R(FBL2) provide a means to change the power supply output voltage when switched in by the CTL1
and CTL2 open drain outputs, respectively. When 12 V is requested by the UFP then CTL2 will go low and place
R(FBL2) in parallel with R(FBL). When 20 V is requested by the UFP then CTL2 remains low and CTL1 goes low
placing R(FBL1) in parallel with R(FBL2) and R(FBL).
38
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Application Information (continued)
VOUT
R(FBU)
R(OB)
C(IZ)
R(FBL2)
R(FBL)
CTL1
R(FBL1)
CTL2
TL431
Copyright © 2016, Texas Instruments Incorporated
Figure 40. Circuit to Change VOUT Upon Sink/UFP Request
R(FBL2) is calculated using Equation 5. In this example, VOUT12 is 12 V and VOUT20 is 20 V. VOUT is the default
output voltage (5 V) for the regulator and is set by R(FBU), R(FBL) and error amplifier VREF.
R (FBL) u R (FBU) u VREF
R (FBL2)
R (FBL) u VOUT12 - VREF - R (FBU) u VREF
(5)
R(FBL1) is calculated using Equation 6 after a standard 1% value for R(FBL2) is chosen.
R (FBL2) u R (FBL)
R (FBL2)
R (FBL2) u R (FBL)
R (FBL1)
R (FBL2)
R (FBL)
R (FBL)
u R (FBU) u VREF
u VOUT20 - VREF - R (FBU) u VREF
(6)
R(FBL1) and R(FBL2) should be large enough so that the CTL1 and CTL2 sinking current is minimized (< 1 mA).
The sinking current for CTL1 and CTL2 is VREF / R(FBL1) and VREF/R(FBL2) respectively.
9.1.5 Voltage Transition Requirements
During VBUS voltage transitions, the slew rate (vSrcSlewPos) must be kept below 30 mV/µs in all portions of the
waveform, settle (tSrcSettle) in less than 275 ms, and be ready (tSrcReady) in less than 285 ms. For most power
supplies, these requirements are met naturally without any special circuitry but in some cases, the voltage
transition ramp rate must be slowed in order to meet the slew rate requirement.
The requirements for linear voltage transitions are shown in Table 7. In all cases, the minimum slew time is
below 1 ms.
Table 7. Minimum Slew-Rate Requirements
Voltage Transition
5 V ↔ 12 V
5 V ↔ 20 V
12 V ↔ 20 V
5V↔9V
5 V ↔ 15 V
9 V ↔ 15 V
Minimum Slew Time
233 µs
500 µs
267 µs
133 µs
333 µs
200 µs
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
39
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
When transition slew control is required, the interaction of the slew mechanism and dc/dc converter loop
response must be considered. A simple R-C filter between the device CTL pins and converter feedback node
may lead to instability under some conditions. Figure 41 shows a method which manages the slew control
without adding capacitance to the converter feedback node.
R(CTL2)
R(SL2A)
R(CTL1)
DC/ DC
Converter
R(FBU)
VOUT
R(SL1A)
VCC
CTL1
Q(CTL2)
R(FBL2)
Q(SL2)
Q(CTL1)
R(SL1B)
C(SL1)
R(FBL1)
R(FBL)
Q(SL1)
R(SL2B)
C(SL2)
FB
TPS25740
CTL2
Copyright © 2017, Texas Instruments Incorporated
Figure 41. Slew-Rate Control Example No. 1
When VOUT = 5 V, both CTL1 and CTL2 are in a high impedance state. When a 5 V to 12 V transition is
requested, CTL2 goes low and turns off Q(CTL2). Q(SL2) gate starts to rise towards VCC at a rate determined by
R(SL2A) + R(SL2B) and C(SL2). Q(SL2) gate continues to rise, until Q(SL2) is fully enhanced placing R(FBL2) in parallel
with R(FBL). In similar fashion when C(TL1) goes low, Q(CTL1) turns off allowing R(FBL1) to slew in parallel with R(FBL2)
and R(FBL).
The slewing resistors and capacitor can be chosen using the following equations. VT is the VGS threshold
voltage of Q(SL1) and Q(SL2). VREF is the feedback regulator reference voltage. Choose the slewing resistance in
the 100 kΩ range to reduce the loading on the bias voltage source (VCC) and then calculate C(SL). The falling
transitions is shorter than the rising transitions in this topology.
Falling transitions:
• 20 V to 12 V
R (SL1B) u C(SL1)
•
'T20V 12V
§V V
·
§
·
REF ¸ ln ¨ VT ¸
ln ¨ T
¨ V(VCC) ¸
¨ V(VCC) ¸
©
¹
©
¹
(7)
12 V to 5 V
R (SL2B) u C(SL2)
'T12V 5V
§V V
·
§
·
REF ¸ ln ¨ VT ¸
ln ¨ T
¨ V(VCC) ¸
¨ V(VCC) ¸
©
¹
©
¹
(8)
Rising transitions:
• 5 V to 12 V
R (SL2A)
•
'T5V 12V
§
§ V V
·
VT ·
T
REF ¸
ln ¨1
¸ ln ¨1
¨ V(VCC) ¸
¨
¸
V
(VCC) ¹
©
¹
©
(9)
12 V to 20 V
R (SL1A)
40
R (SL2B) u C(SL2)
R (SL1B) u C(SL1)
'T12V 20V
§
§ V V
·
VT ·
T
REF ¸
ln ¨1
¸ ln ¨1
¨ V(VCC) ¸
¨
¸
V(VCC) ¹
©
¹
©
Submit Documentation Feedback
(10)
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
Some converter regulators can tolerate a balance of capacitance on the feedback node without affecting loop
stability. The LM5175 has been tested using Figure 42 to combine VOUT slewing with a minimal amount of extra
circuitry.
C(SLU)
R(FBU)
VOUT
FB
R(FBL)
C(SLL)
R(FBL2)
CTL1
LM5175
R(FBL1)
TPS25740
CTL2
Copyright © 2016, Texas Instruments Incorporated
Figure 42. Slew-Rate Control Example No. 2
When a higher voltage is requested from TPS25740, CTL1 or CTL2 goes low changing the sensed voltage at the
FB pin. The LM5175 compensates by increasing C(SLU). As VOUT increases, C(SLU) is charged at a rate
proportional to R(FBU). Three time constants yields a voltage change of approximately 95% and can be used to
calculate the desired slew time. C(SLU) can be calculated using Equation 11 and Equation 12.
'T(SLEW)
C(SLU)
3 u R (FBU) u C(SLU)
(11)
'T(SLEW)
3 u R (FBU)
(12)
In order to minimize loop stability effects, a capacitor in parallel with R(FBL) is required. The ratio of C(SLU)/C(SLL)
should be chosen to match the ratio of R(FBL)/R(FBU). Choose C(SLL) according to Equation 13.
C(SLL)
C(SLU) u
R (FBU)
R (FBL)
(13)
All slew rate control methods should be verified on the bench to ensure that the slew rate requirements are being
met when the external VBUS capacitance is between 1 μF and 100 μF.
9.1.6 VBUS Slew Control using GDNG C(SLEW)
Care should be taken to control the slew rate of Q1 using C(SLEW); particularly in applications where COUT >>
C(SLEW). The slew rate observed on VBUS when charging a purely capacitive load is the same as the slew rate of
V(GDNG) and is dominated by the ratio I(GDNON) / C(SLEW). R(SLEW) helps block C(SLEW) from the GDNG pin enabling
a faster transient response to OCP.
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
41
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
RS
DSCG
VBUS
ISNS
G DN S
GD N G
V PW R
CF
VDD
VBUS
R(DSCG)
RF
RG
C(SLEW)
R(SLEW)
C(PWR)
D(VBUS)
C(PDIN)
Q1
VOUT
TPS25740
Copyright © 2016, Texas Instruments Incorporated
Figure 43. Slew-Rate control Using GDNG
There may be fault conditions where the voltage on VBUS triggers an OVP condition and then remains at a high
voltage even after the TPS25740 configures the voltage source to output 5 V via CTL1 and CTL2. When this
OVP occurs, the TPS25740 opens Q1 within tFOVP + tFOVPDG. The TPS25740 then issues a hard reset, discharge
the power-path via the R(DSCG), and waits for 795 ms before enabling Q1 again. Due to the fault condition the
voltage again triggers an OVP event when the voltage on VBUS exceeds V(FOVP). This retry process would
continue as long as the fault condition persists, periodically pulsing up to V(FOVP) + VSrcSlewPos x (tFOVP + tFOVPDG)
onto the VBUS of the Type-C receptacle. It is recommended to use a slew rate less than the maximum of
VSrcSlewPos (30 mV / µs) allowed by USB (refer to Documentation Support), the slew rate should instead be set in
order to meet the requirement to have the voltage reach the target voltage within tSrcSettle (275 ms). This also
limits the out-rush current from the COUT capacitor into the C(PDIN) capacitor and help protect Q1 and RS.
42
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
9.1.7 Tuning OCP Using RF and CF
In applications where there are load transients or moderate ripple on VOUT, the OCP performance of TPS25740
or TPS25740A may be impacted. Adding the RF/CF filter network as shown in Figure 44 helps mitigate the impact
of the ripple and load transients on OCP performance.
Q1
RS
C(PDIN)
DSCG
VBUS
ISNS
GDNG
GDNS
CF
VPWR
VBUS
R(DSCG)
C(SLEW)
R(SLEW)
C(VPWR)
D(VBUS)
RF
RG
VOUT
VDD
TPS25740
Copyright © 2016, Texas Instruments Incorporated
Figure 44. ISNS Filtering Example
RF/CF can be tailored to the amount of ripple on VOUT as shown in Table 8.
Table 8. Ripple on VOUT
Frequency x Ripple (kHz x V)
Suggested Filter Time Constant (µs)
< 5 (Ex: 50 mV ripple at 100 kHz)
None
5 to 15
2.2 µs ( RF = 10 Ω, CF = 220 nF)
15 to 35
4.7 µs ( RF = 10 Ω, CF = 470 nF)
35 to 105
10 µs ( RF = 10 Ω, CF = 1 µF)
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
43
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
9.2 Typical Application , A/C Power Source (Wall Adapter)
T1
C(VAUX)
D-
VBUS
DSCG
C(RX)
R(DSCG)
100Ÿ
VBUS
D+
CC1
CC2
UFP
HIPWR
PSEL
EN12V
GND
AGND
TPS25740
VAUX
GD
VTX
CIO
P
DVDD
VDD
CTL1
CTL2
PCTRL
TL431
R(FBL1)
GDNS
ISNS
CIZ
GND
R(FBL2)
RF6
RF5
VPWR
ROB
RLC
FB
RCS
P
GDNG C
(SLEW) R(SLEW)
C(VPWR)
VB
CS
R(FBU)
M1
R(FBL)
CDD1
CDD
HV
UCC28740
VS
DRV
RS2
RS1
RG
VDD
LDO
C(PDIN)
COUT
C(DVDD)
t
DVC
RS
DS
P
P
T1
Type-C
Plug
CSD17579Q3A
C(VTX)
CB1
CB2
+
From AC Mains
In this design example, PSEL pin is configured so that P(SEL) = 65 W (see Table 9). Voltages offered are 5 V, 12
V, and 20 V at a maximum of 3 A. The overcurrent protection (OCP) trip point is set just above 3 A and VDD on
the TPS25740 is grounded. The following example is based on PMP11451 and PMP11455, see
www.ti.com/tool/PMP11451. In this design, the TPS25740 and some associated discretes are located on the
paddle card (PMP11455) which plugs into the power supply card (PMP11451). This allows different paddle cards
with different power and voltage advertisements to be used with a common power supply design.
Port Status
Indicator
100kŸ
Copyright © 2016, Texas Instruments Incorporated
Figure 45. Captive Cable Adapter Provider Conceptual Schematic
9.2.1 Design Requirements
Table 9. Design Parameters
Design Parameter
Value
Configured Power Limit, P(SEL)
65 W
Advertised Voltages
5 V, 12 V, 20 V
Advertised Current Limit
3A
Over Current Protection Set point
4.2 A
9.2.2 Detailed Design Procedure
9.2.2.1 Power Pin Bypass Capacitors
• C(VPWR): 0.1 μF, 50 V, ±10%, X7R ceramic at pin 20 (VPWR)
• C(VDD): 0.1 μF, 50 V, X7R ceramic at pin 17 (VDD). If VDD is not used in the application, then tie VDD to
GND.
• C(DVDD): 0.22 μF, 10 V, ±10%, X5R ceramic at pin 13 (DVDD)
• C(VAUX): 0.1 μF, 50 V, ±10%, X7R ceramic at pin 16 (VAUX)
• C(VTX): 0.1 μF, 50 V, ±10%, X7R ceramic at pin 1 (VTX)
9.2.2.2 Non-Configurable Components
• R(SEL): When the application requires advertisement using R(SEL) , use a 100 kΩ, ±1% resistor.
• R(PCTRL): If PCTRL will be pulled low with an external device then it can be connected to VAUX using a 220
kΩ, ±1% resistor. If PCTRL is always high, then it can be directly connected to VAUX.
• R(SLEW): Use a 1 kΩ, ±1% resistor
• RG: Use a 10 Ω, ±1% resistor
44
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
9.2.2.3 Configurable Components
• C(RX): Choose C(RX) between 200 pF and 600 pF. A 560 pF, 50 V, ±5% COG/NPO ceramic is recommended
for both CC1 and CC2 pins.
• Q1: For a 3 A application, an N-Channel MOSFET with RDS(on) in the 10 mΩ range is sufficient. BV(DSS) should
be rated for 30 V for applications delivering 20 V, and 25 V for 12 V applications. For this application, the TI
CSD17579Q3A (SLPS527) NexFET™ is suitable.
• RS: TPS25740 or TPS25740A OCP set point thresholds are targeted towards a 5 mΩ, ±1% sense resistor.
Power dissipation for RS at 3 A load is approximately 45 mW.
• R(DSCG): The minimum value of R(DSCG) is chosen based on the application VBUS (max) and I(DSCGT). For
VBUS (max) = 12 V and I(DSCGT) = 350 mA, R(DSCG(min)) = 34.3 Ω. The size of the external resistor can then be
chosen based on the capacitive load that needs to be discharged and the maximum allowed discharge time
of 265 ms. Typically, a 120 Ω, 0.5 W resistor provides suitable performance.
• RF/CF: Not used
• C(PDIN): The requirement for C(PDIN) is 10 µF maximum. A 6.8 µF, 25 V, ±10% X5R or X7R ceramic capacitor
is suitable for most applications.
• D(VBUS): D(VBUS) provides reverse transient protection during large transient conditions when inductive loads
are present. A Schottky diode with a V(RRM) rating of 30 V in a SMA package such as the B340A-13-F
provideds suitable reverse voltage clamping performance.
• C(SLEW): To achieve a slew rate from zero to 5 V of less than 30 mV / µs using the typical GDNG current of 20
µA then C(SLEW) > 20 µA / 30 mV / µs = 0.67 nF be used. Choosing C(SLEW) = 10 nF yields a ramp rate of 2
mV / µs.
• R(FBL1)/R(FBL2): In this design example, R(FBU) = 20 kΩ and R(FBL) = 20 kΩ. The feedback error amplifier is
TL431AI which is rated for up to 36 V operation and VREF = 2.495 V. Using the equations for R(FBL2) above
yields a calculated value of 7.1 kΩ and a selected value of 7.15 kΩ. In similar fashion for R(FBL1), the
equations yield a calculated value of 6.35 kΩ and a selected value of 6.34 kΩ.
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
45
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
9.2.3 Application Curves
5
11.99
120 VAC/60 Hz
230 VAC/50 Hz
4.99
120 VAC/60 Hz
230 VAC/50 Hz
11.98
Output Voltage (V)
Output Voltage (V)
11.97
4.98
4.97
4.96
11.96
11.95
11.94
11.93
4.95
11.92
4.94
11.91
0
0.5
1
1.5
2
Load Current (A)
2.5
3
3.5
0
0.5
D001
DFP End - VBUS = 5 V
1
1.5
2
Load Current (A)
2.5
3
3.5
D002
DFP End - VBUS = 12 V
Figure 46. Load Regulation
Figure 47. Load Regulation
20.09
120 VAC/60 Hz
230 VAC/50 Hz
20.08
Output Voltage (V)
20.07
20.06
20.05
20.04
20.03
20.02
20.01
0
0.5
1
1.5
2
Load Current (A)
2.5
3
3.5
D003
No Load
DFP End - VBUS = 20 V
Figure 49. VBUS Startup
Figure 48. Load Regulation
No Load
No Load
Figure 50. VBUS 5 V – 12 V Transition
46
Submit Documentation Feedback
Figure 51. VBUS 12 V – 5 V Transition
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
No Load
No Load
Figure 52. VBUS 12 V – 20 V Transition
No Load
Figure 53. VBUS 20 V – 12 V Transition
No Load
Figure 54. VBUS 5 V – 20 V Transition
Figure 55. VBUS 20 V – 5 V Transition
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
47
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
9.2.4 Typical Application, D/C Power Source
100 Ÿ
SW2
C(PDIN)
C(RX)
C(RX)
DSCG
VBUS
GDNS
ISNS
CC1
CC2
VDD
TPS25740A
CTL1
UFP
C(VTX)
CS
CSG
DVDD
PCTRL
CTL2
FB
Type-C
plug
D-
R(DSCG)
GDNG C
(SLEW) R(SLEW)
R(FBU)
R(FBL1)
C(DVDD)
HIPWR
PSEL
EN9V
GND
AGND
C(SLL)
R(FBL2)
0.1µF
SW2
100 Ÿ
CSG
C(VAUX)
CS
CSG
PGOOD
HDRV2
47 pF
VOUT
0.08Ÿ
BOOT2
AGND
C(SLU)
CS
LDRV2
COMP
VOSNS
0.022µF
LM5175
SS
ISNS(-)
10 NŸ
1µF
PGND
SLOPE
ISNS(+)
100 pF
SW2
SW1
VCC
100 pF
0.1µF
4.7µH
VOUT
0.1µF
VAUX
GD
VTX
RT/SYNC
RG
VPWR
BOOT1
SW1
VIN
HDRV1
LDRV1
BIAS
VBUS
D+
Rs
COUT
R(FBL)
84.5NŸ
MODE
DITH
4.7 µF
x5
VCC
0Ÿ
EN/UVLO
249 NŸ
59 NŸ
93.1NŸ
CSD17579Q3A
VOUT
100Ÿ
VCC
+
VISNS
68 µF
0.1µF
+
C(VPWR)
10 Ÿ 0.1µF
6V-42V
VIN
SW1
In this design example the PSEL pin is configured such that P(SEL) = 65 W (see Table 10). Voltages offered are 5
V, 9 V, and 15 V at a maximum of 3 A. The overcurrent protection (OCP) trip point is set just above 3 A and VDD
on the TPS25740A is grounded. The following example is based on TPS25740AEVM-741 (refer to
Documentation Support).
Port Status
indicator
100NŸ
Copyright © 2016, Texas Instruments Incorporated
Figure 56. DC Power Source
9.2.4.1 Design Requirements
Table 10. Design Parameters
Design Parameter
Value
Configured Power Limit, P(SEL)
65 W
Advertised Voltages
5 V, 9 V, 15 V
Advertised Current Limit
3A
Over Current Protection Set point
4.2 A
9.2.4.2 Detailed Design Procedure
9.2.4.2.1 Power Pin Bypass Capacitors
•
•
•
•
•
C(VPWR): 0.1 μF, 50 V, ±10%, X7R ceramic at pin 20 (VPWR)
C(VDD): 0.1 μF, 50 V, X7R ceramic at pin 17 (VDD). If VDD is not used in the application, then tie VDD to
GND.
C(DVDD): 0.22 μF, 10 V, ±10%, X5R ceramic at pin 13 (DVDD)
C(VAUX): 0.1 μF, 50 V, ±10%, X7R ceramic at pin 16 (VAUX)
C(VTX): 0.1 μF, 50 V, ±10%, X7R ceramic at pin 1 (VTX)
9.2.4.2.2 Non-Configurable Components
•
•
•
•
48
R(SEL): When the application requires advertisement using R(SEL) , use a 100 kΩ, ±1% resistor.
R(PCTRL): If PCTRL will be pulled low with an external device then it can be connected to VAUX using a 220
kΩ, ±1% resistor. If PCTRL will always be high then it can be directly connected to VAUX.
R(SLEW): Use a 1 kΩ, ±1% resistor
RG: Use a 10 Ω, ±1% resistor
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
9.2.4.2.3 Configurable Components
•
•
•
•
•
•
•
•
•
•
C(RX): Choose C(RX) between 200 pF and 600 pF. A 560 pF, 50 V, ±5% COG/NPO ceramic is recommended
for both CC1 and CC2 pins.
Q1: For a 3 A application, an N-Channel MOSFET with RDS(on) in the 10 mΩ range is sufficient. BV(DSS) should
be rated for 30 V for applications delivering 20 V, and 25 V for 12 V applications. For this application, the TI
CSD17579Q3A (SLPS527) NexFET™ is suitable.
RS: TPS25740 or TPS25740A OCP set point thresholds are targeted towards a 5 mΩ, ±1% sense resistor.
Power dissipation for RS at 3 A load is approximately 45 mW.
R(DSCG): The minimum value of R(DSCG) is chosen based on the application VBUS (max) and I(DSCGT). For
VBUS (max) = 12 V and I(DSCGT) = 350 mA, RDS(CG(min)) = 34.3 Ω. The size of the external resistor can then be
chosen based on the capacitive load that needs to be discharged and the maximum allowed discharge time
of 265 ms. Typically, a 120 Ω, 0.5 W resistor provides suitable performance.
RF/CF: Not used
C(PDIN): The requirement for C(PDIN) is 10 µF maximum. A 6.8 µF, 25 V, ±10% X5R or X7R ceramic capacitor
is suitable for most applications.
D(VBUS): D(VBUS) provides reverse transient protection during large transient conditions when inductive loads
are present. A Schottky diode with a V(RRM) rating of 30 V in a SMA package such as the B340A-13-F
provideds suitable reverse voltage clamping performance.
C(SLEW): To achieve a slew rate from zero to 5 V of less than 30 mV / µs using the typical GDNG current of 20
µA then C(SLEW) (nF) > 20 µA / 30 mV / µs = 0.67 nF be used. Choosing C(SLEW) = 10 nF yields a ramp rate of
2 mV / µs.
R(FBL1)/R(FBL2): In this design example, R(FBU) = 49.9 kΩ and R(FBL) = 9.53 kΩ. The feedback error amplifier
VREF = 0.8 V. Using the equations for R(FBL2) (Equation 5 and Equation 6) provide a calculated value of 9.9 kΩ
and a selected value of 9.76 kΩ. In similar fashion for R(FBL1), a calculated value of 6.74 kΩ and a selected
value of 6.65 kΩ is provided.
C(SLU)/C(SLL): The value of C(SLU) is calculated based on the desired 95% slew rate using Equation 12 and
Equation 13. Choose a 22 nF capacitor for C(SLU). Choose a 100 nF capacitor for C(SLL).
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
49
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
9.2.4.3 Application Curves
VBUS
VBUS
VGDNG
VGDNG
VCTL1
VCTL1
VCTL2
VCTL2
No Load
No Load
Figure 57. VBUS 5 V – 9 V Transition
Figure 58. VBUS 9 V – 5 V Transition
VBUS
VBUS
VGDNG
VGDNG
VCTL1
VCTL1
VCTL2
VCTL2
No Load
No Load
Figure 59. VBUS 9 V – 15 V Transition
Figure 60. VBUS 15 V – 9 V Transition
VBUS
VGDNG
VBUS
VGDNG
VCTL1
VCTL1
VCTL2
VCTL2
No Load
No Load
Figure 61. VBUS 5 V – 15 V Transition
50
Submit Documentation Feedback
Figure 62. VBUS 15 V – 5 V Transition
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
9.3 System Examples
9.3.1 D/C Power Source (Power Hub)
In this system design example, the P(SEL) is configured such that P(SEL) = 93 W and 5 V, 12 V or 20 V are offered
at a maximum of 5 A. The over-current protection (OCP) trip point is set just above 5 A.
REN
24V Bulk Power
R(UVLO1)
3 x REN
R(UVLO2)
CSD17578Q3A (2x)
GD
220kŸ
HIPWR
EN12V
VTX
AGND
GND
UFP
C(VTX)
VAUX
DVDD
C(DVDD)
CC1
CC2
TPS25740
CTL1
CTL2
C(RX)
C(RX)
R(PG)
Slew Control
SHIELD
VDD
VBUS
DSCG
ISNS
GDNS
GDNG
C(PDIN)
R(DSCG)
RG
RG
C(SLEW) R(SLEW)
CC3 RC2
RC3
Type-C
Receptacle
C(VAUX)
C(VDD)
PGND
ILIM
PGOOD
PCTRL
TRK
AGND
VDD
LDRV
PSEL
RC1
R(TRK)
COMP
RC4
CC1
TPS40170
COUT
FB
CC2
HDRV
SW
VBP
SS
C(VBP)
C(SS)
R(ILIM)
R(RT)
VPWR
EN
RT
VIN
BOOT
C(BOOT)
SYNC
CIN
UVLO
M/S
Copyright © 2016, Texas Instruments Incorporated
Figure 63. Power Hub Concept (Provider only)
This power hub circuit takes a 24 V input and produces a regulated output voltage. The over-current protection
feature in the TPS25740 is not used; the ISNS and VBUS pins are connected directly. Instead R(ILIM) is chosen to
set the current limit of the TPS40170 synchronous PWM buck controller. If the current limit trips, the GD pin of
the TPS25740 is pulled low by the PGOOD pin of the TPS40170, which causes the power-path switch to be
opened. Other fault conditions may also pull PGOOD low, but the slew rate of the voltage transition should be
controlled as in one of the examples given above (Figure 41, Figure 42, or Figure 43).
VDD on the TPS25740 is grounded, if there is a suitable power supply available in the system the TPS25740
operates more efficiently if it is connected to VDD since V(VPWR) > V(VDD). See Figure 66 for an example.
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
51
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
System Examples (continued)
9.3.2 A/C Power Source (Wall Adapter)
T1
VDD
CTL1
CTL2
C(PDIN)
C(RX)
R(DSCG)
DSCG
VBUS
TPS25740
UFP
C(VAUX)
CIO
D-
CC1
CC2
HIPWR
PSEL
EN12V
GND
AGND
TL431
P
R(FBL2)
GDNS
ISNS
CIZ
C(DVDD)
GND
VAUX
GD
VTX
DVDD
RLC
FB
RF6
RF5
RCS
P
C(VTX)
ROB
R(FBU)
VB
CS
R(FBL2)
DRV
VPWR
C(VPWR)
CDD1
CDD1
M1
VS
RS2
RS1
HV
UCC28740
GDNG C
(SLEW) R(SLEW)
VDD
LDO
R(FBL)
DVC
RG
100 Ÿ
COUT
PCTRL
±
T1
RS
DS
P
P
Type-C
Plug
VBUS
D+
CSD17579Q3A
CB2
CB1
+
From AC Mains
In this system design example, the PSEL pin is configured such that P(SEL) = 36 W, and only 5 V and 12 V are
offered at a maximum of 3 A. The overcurrent protection (OCP) trip point is set just above 3 A. VDD on the
TPS25740 is grounded, if there is a suitable power supply available in the system the TPS25740 operates more
efficiently if it is connected to VDD since V(VPWR) > V(VDD).
Port Status
indicator
100 NŸ
Copyright © 2016, Texas Instruments Incorporated
Figure 64. Adapter Provider Concept
52
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
System Examples (continued)
9.3.3 Dual-Port Power Managed A/C Power Source (Wall Adaptor)
In this system design example, the PSEL pin is configured such that P(SEL) = 36 W, and only 5 V and 12 V are
offered at a maximum of 3 A. The over-current protection (OCP) trip point is set just above 3 A.
The UFP pin from one TPS25740 is attached to the PCTRL pin on the other TPS25740. When one port is not
active (no UFP attached through the receptacle) its UFP pin is left high-z so the PCTRL pin on the other port is
pulled high. This allows the adaptor to provide up to the full 36 W on a single port if a single UFP is attached. If
two UFP’s are attached (one to each port) then each port only offers current that would reach a maximum of 18
W. So each port is allocated half of the overall power when each port has a UFP attached.
RS
VDD
CTL1
CTL2
UFP
PCTRL
C(PDIN)
R(DSCG)
C(RX)
C(RX)
VBUS
DSCG
ISNS
C(VTX)
C(DVDD)
R(DSCG)
10Ÿ
VBUS
VDD
VBUS
D+
Type-C
receptacle
#2
D-
CC1
CC2
DVDD
PSEL
EN12V
GND
AGND
VTX
HIPWR
GD
TPS25740
VAUX
CTL1
CTL2
UFP
PCTRL
DSCG
GDNG
GDNS
ISNS
C(SLEW)
R(SLEW)
10Ÿ
C(PDIN)
RS
C(RX)
CSD17578Q3A (2X)
VPWR
D-
DVDD
PSEL
EN12V
GND
AGND
VAUX
C(AUX)
5V, 12V, or 20V
Type-C
receptacle
#1
100NŸ
220NŸ
DC/DC
Buck
Circuit
(36W)
VBUS
D+
CC1
CC2
TPS25740
GD
VTX
HIPWR
24V
GDNS
GDNG
VPWR
AC/DC
Fly-Back
Circuit
(36W)
10Ÿ
C(SLEW)
R(SLEW)
10Ÿ
100Ÿ
CSD17578Q3A (2x)
100Ÿ
5V, 12V, or 20V
C(RX)
DC/DC
Buck
Circuit
(36W)
100NŸ
220NŸ
C(AUX)
C(VTX)
C(DVDD)
Copyright © 2016, Texas Instruments Incorporated
Figure 65. Dual-Port Adapter Provider Concept
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
53
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
System Examples (continued)
9.3.4 D/C Power Source (Power Hub with 3.3 V Rail)
In Figure 66, an LDO that outputs at least I(SUPP) at 3.3 V or 5 V is added to the power hub concept, and the
DVDD pin is used to enable the buck regulator since it is active high. For an active low buck regulator, the UFP
pin could be used. This implementation is more power efficient than the one in Figure 63.
24V Bulk Power
3.3V
LDO
C(PDIN)
DSCG
VDD
VBUS
C(RX)
C(SLEW)
R(DSCG)
R(SLEW)
SHIELD
R(PG)
GD
HIPWR
GND
EN12V
AGND
VTX
C(VTX)
DVDD
PSEL
PCTRL
220NŸ
C(VAUX)
C(DVDD)
UFP
VAUX
TPS25740
CTL1
CTL2
Slew
Control
CC1
CC2
R(SEL)
C(VDD)
PGND
ILIM
PGOOD
ISNS
R(TRK)
GDNS
RC1
LDRV
C(VPWR)
CC1
COMP
TRK
AGND
VDD
GDNG
TPS40170
VPWR
FB
CC1
CC3 RC2
HDRV
SW
VBP
SS
RC4
C(SS)
Type-C
Plug
RG
RC3
RT
COUT
R(RT)
CSD17579Q3A
C(BOOT)
EN
R(ILIM)
SYNC
C(VBP)
UVLO
VIN
BOOT
M/S
CIN
R(UVLO1)
R(UVLO)
Copyright © 2016, Texas Instruments Incorporated
Figure 66. Power Hub Concept (Provider only)
10 Power Supply Recommendations
10.1 VDD
The recommended VDD supply voltage range is 3 V to 5.5 V. The device requires approximately 2 mA (I(SUPP))
typical in normal operating mode and below 10 µA in sleep mode. If the VDD supply is not used, then it may be
connected to AGND/GND.
10.2 VPWR
The recommended VPWR supply voltage range is 0 V to 25 V. The device requires approximately 2 mA (I(SUPP))
typical in normal operating mode and below 10 µA in sleep mode.
54
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
11 Layout
11.1 Port Current Kelvin Sensing
16
15
14
13
VAUX
GD
PCTRL
DVDD
18
17
AGND
VDD
Figure 67 provides a routing example for accurate current sensing for the overcurrent protection feature. The
sense amplifier measurement occurs between the ISNS and VBUS pins of the device. Improper connection of
these pins can result in poor OCP performance.
19
ISNS
20
VPWR
21
22
VBUS
GDNG
23
24
PSEL
12
UFP
11
N/C
N/C
10
GDNS
EN12V
8
DSCG
CTL2
7
CC2
GND
HIPWR
CTL1
3
5
6
CC1
4
VTX
1
2
PAD
9
CF
RF
Top Trace
Top Plane
Bottom Trace/ Plane
RS
VIA
Q1 Source
VBUS
Current Flow
Figure 67. Kelvin Sense Layout Example
11.2 Layout Guidelines
11.2.1 Power Pin Bypass Capacitors
• C(VPWR): Place close to pin 20 (VPWR) and connect with low inductance traces and vias according to
Figure 68.
• C(VDD): Place close to pin 17 (VDD) and connect with low inductance traces and vias according to Figure 68.
• C(DVDD): Place close to pin 13 (DVDD) and connect with low inductance traces and vias according to
Figure 68.
• C(VAUX): Place close to pin 16 (VAUX) and connect with low inductance traces and vias according to
Figure 68.
• C(VTX): Place close to pin 1 (VTX) and connect with low inductance traces and vias according to Figure 68.
11.2.2 Supporting Components
• C(RX): Place C(RX1) and C(RX2) in line with the CC1 and CC2 traces as shown in Figure 23. These should be
placed within one inch from the Type C connector. Minimize stubs and tees from on the trace routes.
• Q1: Place Q1 in a manner such that power flows uninterrupted from Q1 drain to the Type C connector VBUS
connections. Provide adequate copper plane from Q1 drain and source to the interconnecting circuits.
• RS: Place RS as shown in Figure 68 to facilitate uninterrupted power flow to the Type C connector. Orient RS
for optimal Kelvin sense connection/routing back to the TPS25740 or TPS25740A. In high current applications
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
55
TPS25740, TPS25740A
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
www.ti.com
Layout Guidelines (continued)
where the power dissipation is over 250 mW, provide an adequate copper feed to the pads of RS.
RG: Place RG near Q1 as shown in Figure 68. Minimize stray leakage paths as the GDNG sourcing current
could be affected.
R(SLEW)/C(SLEW): Place R(SLEW) and C(SLEW) near RG as shown in Figure 68.
R(DSCG): Place on top of the VBUS copper route and connect to the DSCG pin with a 15 mil trace.
RF/CF: When required, place RF and CF as shown in Figure 68 to facilitate the Kelvin sense connection back
to the device.
C(VBUS)/D(VBUS): Place C(VBUS) and D(VBUS) within one inch of the Type C connector and connect them to VBUS
and GND using adequate copper shapes.
R(SEL)/R(PCTRL): Place R(SEL) and R(PCTRL) near the device.
•
•
•
•
•
•
11.3 Layout Example
CVAUX
CVDD
GND
RPCNTRL
12
UFP
11
N/C
N/C
10
GDNS
EN12V
8
DSCG
CTL2
7
PAD
CTL1
GND
CRX2
6
5
CC2
3
4
CC1
VTX
1
To DC/DC
Converter
9
CRX1
CC2
CC1
RDSCG
CF
CVTX
2
GND
HIPWR
G
4
RSEL
PSEL
RG
RF
CDVDD
VBUS
Top Trace
DVBUS
CPDIN
RS
USB Type-C Plug
24
13
23
DVDD
VBUS
GDNG
15
14
22
16
21
GD
PCTRL
VPWR
VAUX
D
18
ISNS
20
17
D
S
3
19
AGND
VDD
D
S
2
S
Q1
1
CVPWR
5
CSLEW
6
RSLEW
7
D
VOUT
8
DC/DC
Converter
The basic component placement and layout is provided in Figure 68. This layout represents the circuit shown in
Figure 36. The layout for other power configurations will vary slightly from that shown below.
Top Plane
Bottom Trace/ Plane
VIA
Figure 68. Example Layout
56
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
TPS25740, TPS25740A
www.ti.com
SLVSDG8B – APRIL 2016 – REVISED JUNE 2017
12 Device and Documentation Support
12.1 Documentation Support
USB PD and USB Type-C specifications available at: http://www.usb.org/home
TPS25740EVM-741 and TPS25740AEVM-741 EVM User's Guide
TPS25740/TPS25740A Design Calculator Tool
12.2 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 11. Related Links
PARTS
PRODUCT FOLDER
ORDER NOW
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
TPS25740
Click here
Click here
Click here
Click here
Click here
TPS25740A
Click here
Click here
Click here
Click here
Click here
12.3 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
12.4 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
12.5 Trademarks
E2E is a trademark of Texas Instruments.
12.6 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
12.7 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
Copyright © 2016–2017, Texas Instruments Incorporated
Product Folder Links: TPS25740 TPS25740A
Submit Documentation Feedback
57
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
TPS25740ARGER
NRND
VQFN
RGE
24
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
TPS
25740A
TPS25740ARGET
NRND
VQFN
RGE
24
250
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
TPS
25740A
TPS25740RGER
NRND
VQFN
RGE
24
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
TPS
25740
TPS25740RGET
NRND
VQFN
RGE
24
250
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
TPS
25740
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
工商网监
湘ICP备2023018690号
