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Table of Contents
User’s Guide
TPS5442x5 Step-Down Converter Evaluation Module
User's Guide
Table of Contents
1 Introduction.............................................................................................................................................................................3
2 Description.............................................................................................................................................................................. 3
2.1 Typical End-User Applications........................................................................................................................................... 3
2.2 EVM Features.................................................................................................................................................................... 3
3 EVM Electrical Performance Specifications.........................................................................................................................3
4 Schematic................................................................................................................................................................................4
5 Test Setup................................................................................................................................................................................5
5.1 Test and Configuration Software........................................................................................................................................ 5
5.2 Test Equipment.................................................................................................................................................................. 5
5.3 The PWR-681EVM.............................................................................................................................................................6
5.4 List of Test Points, Jumpers ans Switch.............................................................................................................................7
6 EVM Configuration Using the Fusion GUI............................................................................................................................8
6.1 Configuration Procedure.................................................................................................................................................... 9
7 Test Procedure...................................................................................................................................................................... 10
7.1 Line/Load Regulation Measurement Procedure...............................................................................................................10
7.2 Efficiency..........................................................................................................................................................................10
7.3 Bode Plot Measurement Procedure................................................................................................................................. 10
7.4 Equipment Shutdown....................................................................................................................................................... 10
8 Performance Data and Typical Characteristic Curves.......................................................................................................11
8.1 Efficiency.......................................................................................................................................................................... 11
8.2 Load Regulation............................................................................................................................................................... 11
8.3 Line Regulation................................................................................................................................................................ 12
8.4 Transient Response......................................................................................................................................................... 12
8.5 Output Ripple................................................................................................................................................................... 13
8.6 Control On........................................................................................................................................................................14
8.7 Control Off........................................................................................................................................................................15
8.8 Overcurrent Protection..................................................................................................................................................... 15
8.9 Control Loop Bode Plot.................................................................................................................................................... 16
8.10 Thermal Image............................................................................................................................................................... 17
9 Fusion GUI.............................................................................................................................................................................18
10 EVM Assembly Drawing and PCB Layout........................................................................................................................ 39
11 List of Materials...................................................................................................................................................................42
12 Revision History................................................................................................................................................................. 43
List of Figures
Figure 4-1. PWR-681EVM Schematic......................................................................................................................................... 4
Figure 5-1. PWR-681EVM Overview........................................................................................................................................... 6
Figure 5-2. Tip and Barrel Measurement..................................................................................................................................... 6
Figure 8-1. Efficiency of 0.95-V Output vs Line and Load..........................................................................................................11
Figure 8-2. Load Regulation of 0.95-V Output........................................................................................................................... 11
Figure 8-3. Line Regulation of 0.95-V Output............................................................................................................................ 12
Figure 8-4. Transient Response of 0.95-V Output at 12 VIN, Transient is 0 A to 20 A, 2.5 A/µs............................................... 12
Figure 8-5. Output Ripple and SW Node of 0.95-V Output at 12 VIN, 0-A Output..................................................................... 13
Figure 8-6. Output Ripple and SW Node of 0.95-V Output at 12 VIN, 20-A Output................................................................... 13
Figure 8-7. Start up from Control, 0.95-V Output at 12 VIN, 20-A Output.................................................................................. 14
Figure 8-8. 0.5-V Pre-biase start up from Control, 0.95-V Output at 12 VIN, 0-A Output...........................................................14
Figure 8-9. Soft Stop from Control, 0.95-V Output at 12 VIN, 20-A Output................................................................................ 15
Figure 8-10. Overcurrent Protection, 0.95-V Output at 12 VIN, 36-A Output............................................................................. 15
Figure 8-11. Restart from Overcurrent Protection, 0.95-V Output at 12 VIN ............................................................................. 16
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Trademarks
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Figure 8-12. Bode Plot at 0.95-V Output at 12 VIN, 20-A Output............................................................................................... 16
Figure 8-13. Thermal Image at 0.95-V Output at 12 VIN, 20-A Output...................................................................................... 17
Figure 8-14. Thermal Image at 0.95-V Output at 12 VIN, 30-A Output...................................................................................... 17
Figure 9-1. First Window at Fusion Launch............................................................................................................................... 18
Figure 9-2. Scan Finds Device Successfully............................................................................................................................. 18
Figure 9-3. Software Launch Continued.................................................................................................................................... 19
Figure 9-4. Software Launch Continued.................................................................................................................................... 19
Figure 9-5. First Screen After Successful Launch Configure: Limits and On/Off.......................................................................20
Figure 9-6. Configure: Limits and On/Off- On/Off Configuration Pop-up................................................................................... 21
Figure 9-7. Configure: Limits and On/Off- On/Off Config Pop-Up with Change.........................................................................22
Figure 9-8. Configure: Advanced...............................................................................................................................................23
Figure 9-9. Configure: Device Info.............................................................................................................................................24
Figure 9-10. Configure: SMBALERT # Mask............................................................................................................................. 25
Figure 9-11. Configure: All......................................................................................................................................................... 26
Figure 9-12. Configure: All Config- On/Off Config Pop-up.........................................................................................................27
Figure 9-13. Configure: Store Config to NVM ...........................................................................................................................28
Figure 9-14. Change View Screen to Monitor Screen............................................................................................................... 29
Figure 9-15. Monitor Screen...................................................................................................................................................... 30
Figure 9-16. System Dashboard................................................................................................................................................31
Figure 9-17. Status Screen........................................................................................................................................................32
Figure 9-18. Import Project / Import Configuration File..............................................................................................................33
Figure 9-19. Store Configuration To Memory.............................................................................................................................34
Figure 9-20. Data Logging......................................................................................................................................................... 35
Figure 9-21. Data Log File......................................................................................................................................................... 36
Figure 9-22. PMBus Logging..................................................................................................................................................... 37
Figure 9-23. PMBus Log Details................................................................................................................................................38
Figure 10-1. PWR-681EVM Top Layer Assembly Drawing (top view).......................................................................................39
Figure 10-2. PWR-681EVM Top Layer (top view)......................................................................................................................39
Figure 10-3. PWR-681EVM Layer 1 (top view)......................................................................................................................... 40
Figure 10-4. PWR-681EVM Layer 2 (top view)......................................................................................................................... 40
Figure 10-5. PWR-681EVM Bottom Layer (top view)................................................................................................................ 41
Figure 10-6. PWR-681EVM Bottom Layer Assembly Drawing (top view)................................................................................. 41
List of Tables
Table 3-1. PWR-681EVM Electrical Performance Specifications................................................................................................ 3
Table 5-1. The Function of Each Test Point................................................................................................................................. 7
Table 6-1. Key Factory Configuration Parameters.......................................................................................................................8
Table 7-1. List of Test Points for Line/Load Measurements....................................................................................................... 10
Table 7-2. List of Test Points for Efficiency Measurements........................................................................................................10
Table 11-1. PWR681 List of Materials .......................................................................................................................................42
Trademarks
All trademarks are the property of their respective owners.
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Introduction
1 Introduction
The PWR681EVM evaluation module uses either the TPS544B25 or TPS544C25 devices. The TPS544B25 and
TPS544C25 are highly integrated synchronous buck converters that are designed for up to 20-A or 30-A current
output, respectively.
2 Description
The PWR681EVM is designed as a single output DC-DC converter that demonstrates either the TPS544B25
or the TPS544C25 in a typical low-voltage application while providing a number of test points to evaluate the
performance. It uses a nominal 12-V input bus to produce a regulated 0.95-V output at up to either 20-A or 30-A
of load current, depending on the device installed.
2.1 Typical End-User Applications
•
•
•
•
High-Density Power Solutions
Communications Equipment
Servers and Computing Equipment
Smart Power Systems
2.2 EVM Features
•
•
•
•
Regulated 0.95-V output up to 30-ADC, steady-state output current
Configuarable features via the PMBus interface include:
– Programmable Output Voltage via the PMBus Interface
– Programmable UVLO, Soft Start, and Enable via the PMBus Interface
– Programmable Overcurrent Warning, Fault Limits and Programmable Response to Faults via the PMBus
Interface
– Programmable Overvoltage, Undervoltage Warning, Fault Limit and Programmable Response to Faults
via the PMBus Interface
– Programmable external Overtemperature Warning, Fault Limit and Programmable Response to Faults via
the PMBus Interface
Convenient Test Points for Probing Critical Waveforms
Optional External Temperature Sensor
3 EVM Electrical Performance Specifications
Table 3-1. PWR-681EVM Electrical Performance Specifications
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
4.5
12
18
UNITS
Input Characteristics
Voltage range
VIN
Maximum input current
VIN = 8 V, IO = 30 A
No load input current
VIN = 12 V, IO = 0 A
5
42
V
A
mA
Output Characteristics
VOUT
Output voltage
Output current = 10 A
IOUT
Output load current
IOUT(min) to IOUT(max)
Output voltage regulation
VOUT
Output voltage ripple
VOUT
Output overcurrent
0.95
0
30
Line regulation: input voltage = 4.5 V to 18 V
0.5%
Load regulation: output current = 0 A to IOUT(max)
0.5%
VIN = 12 V, IOUT = 30 A
V
A
20
mVPP
36
A
500
kHz
Systems Characteristics
VOUT
Switching frequency
FSW
Peak efficiency
VIN = 12 V, IO = 13 A, FSW = 500 kHz
Operating temperature
Toper
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88%
0
105
°C
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Schematic
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4 Schematic
S1
TP12
U2
1
8
7
6
VNC
NC
NC
LM334SM/NOPB
R2
R20
100k
33pF
R21
38.3k
C3
10.5k
Q2
2N7002E-T1-E3
21.5
3
R1
BP3
C1
Q1
MMBT3904
C2
1000pF
1200pF
R3
BP3
TP3
R5
39
40
37
38
RT
10
22
VIN
SW
11
VIN
SW
R12
51.1k
JP2
GND
DATA
TP9
CLK
TP4
SMBALERT
R13
VOUTS+
49.9
C5
R14
0
330pF
C9
TP1
0.1µF
L1
TP5
R15
VOUTS-
VOUT = 0.95V @ 30A MAX ("C" version)
49.9
TP6
J3
12
470nH
744301047
C10
1000pF
GND
C18
6800pF
BOTTOM
51.1k
9
TP13
C11
C12
C21
100µF 100µF 100µF
C22
C23
C19
100µF 100µF 22µF
C20
22µF
R16
1
13
C17
6800pF
TOP
SYNC/RESET_B
SW
GND
VIN
GND
23
14
C16
22µF
AGND
SW
SW
GND
CNTL
R11
8
VIN
PGND
C15
22µF
PMBus
7
VIN
2
4
6
8
10
R10
10.0k
6
BOOT
20
C14
22µF
PGND
15
GND
TSNS/SS
SMBALERT
21
C13
22µF
35
BP3
J1
C24
100µF
36
5
GND
GND
COMP
CLK
GND
GND
PGOOD
BP6
17
JP1
VIN = 4.5V - 18V
FB
28
24
40.2k
3
4
25
C8
2.2µF
C7
4.7µF
ADDR0
DATA
GND
R17
0
VSET
VDD
26
R7
2
29
27
BP3
DNP
1
CNTL
ADDR1
16
C6
1µF
30
DNP
VOUTSVOUTS+
GND
R19
GND
32
31
18
VOUTSVOUTS+
TP8
34
33
BP3
R18
10.0k
10.0k
R4
U1
TPS544C25RVF
300
DIFFO
1200pF
GND
R9
DNP
49.9
R8
19
10.0k
C4
GND
GND
D1
Pink
TP2
R6
J2
1
3
5
7
9
TP7
SMBALERT
DATA
V+
R
NC
NC
CLK
CNTL
3
2
4
5
2
1
TP11
C27
C25
DNP
C28
C26 100µF 100µF
DNP
J4
TP10
TP14
FSW = 500KHz
GND
Figure 4-1. PWR-681EVM Schematic
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Test Setup
5 Test Setup
5.1 Test and Configuration Software
To change any of the default configuration parameters on the EVM, it is necessary to obtain the TI Fusion Digital
Power Designer software. This can be downloaded from the TI website.
5.1.1 Description
The Fusion Digital Power Designer is the graphical user interface (GUI) used to configure and monitor the Texas
Instruments TPS544B25 or TPS544C25 power converter installed on this evaluation module. The application
uses the PMBus protocol to communicate with the controller over serial bus by way of a TI USB adapter. This
adapter can be purchased at http://www.ti.com/tool/usb-to-gpio.
Note
The TI USB adapter must be purchased separately. It is not included with this EVM kit.
5.1.2 Features
Some of the tasks performed with the GUI include:
•
•
•
Turn on or off the power supply output, either through the hardware control line or the PMBus operation
command.
Monitor real-time data. Items such as input voltage, output voltage, output current, temperature, and warnings
and faults are continuously monitored and displayed by the GUI.
Configure common operating characteristics such as VOUT, UVLO, soft-start time, warning and fault
thresholds, fault response, and ON/OFF.
This software is available for download at http://www.ti.com/tool/fusion_digital_power_designer
5.2 Test Equipment
Voltage Source: The input voltage source VIN must be a 0-V to 18-V variable dc source capable of supplying at
least 8 ADC. Connect VIN to J1 Figure 5-1.
Multimeters: It is recommended to use two separate multimeters Figure 5-1. One meter is used to measure VIN
and one to measure VOUT.
Output Load: A variable electronic load is recommended for testing Figure 5-1. It must be capable of 30 A at
voltages as low as 0.9 V.
Oscilloscope: An oscilloscope is recommended for measuring output noise and ripple. Output ripple must
be measured using a tip-and-barrel method or better as shown in Figure 5-2.The scope must be adjusted to
20-MHz bandwidth, ac coupling at 50 mV/division, and must be set to 1-µs/division.
Fan: During prolonged operation at high loads, it may be necessary to provide forced air cooling with a small fan
aimed at the EVM. Temperature of the devices on the EVM must be maintained below 105°C.
USB-to-GPIO Interface Adapter: A communications adapter is required between the EVM and the host
computer. This EVM was designed to use the Texas Instruments USB-to-GPIO Adapter. This adapter can be
purchased at http://www.ti.com/tool/usb-to-gpio.
Recommended Wire Gauge: The voltage drop in the load wires must be kept as low as possible in order to
keep the working voltage at the load within its operating range. See the following table for recommended wire
gauge and length to achieve a voltage drop of no more than 0.2 V at the maximum 30-A load.
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Test Setup
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AWG GAUGE
OHMS PER FOOT
(Ω)
LOAD WIRES COMBINED
LENGTH
(Ft)
EACH WIRE LENGTH
(Ft)
12
1.59E-3
6.30
3.15
14
2.53E-3
3.96
1.98
16
4.02E-3
2.49
1.25
18
6.39E-3
1.57
0.78
Note
If AWG 12 wire is used, no more than 3.15 feet of wire must be used between the EVM and the load.
5.3 The PWR-681EVM
Figure 5-1. PWR-681EVM Overview
Metal Ground
Barrel
Probe
Tip
Tip and Barrel VOUT Ripple
Measurement
Figure 5-2. Tip and Barrel Measurement
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Test Setup
5.4 List of Test Points, Jumpers ans Switch
Table 5-1. The Function of Each Test Point
ITEM
TYPE
NAME
TP1
T-H loop
SW
DESCRIPTION
TP2
T-H loop
CH-B
Measure loop stability
TP3
T-H loop
CH-A
Measure loop stability
TP4
T-H loop
V_sense +
Remote sense +
TP5
T-H loop
V_sense –
Remote sense –
TP6
T-H loop
Vout
TP7
T-H loop
SYNC/RST
TP8
T-H loop
VDD
Power supply Switch Node
Use this VOUT for efficiency measurements
Input a sync signal from a clock source; or apply logic low signal to RESET
VOUT to initial boot-up voltage set by VSET pin. Refer to the Datasheet for
details.
Supplies the internal circuitry
TP9
T-H loop
SMB_Alert
Monitor alerts
TP10
T-H loop
GND
Common GND
TP11
T-H loop
Tsns/SS
Monitor the voltage on the TSNS/SS pin
TP12
T-H loop
PGOOD
PGOOD (also drives LED lamp)
TP13
T-H loop
VOUT
Use for tip-barrel ripple measurement
TP14
T-H loop
GND
Use for tip-barrel ripple measurement
JP1
2-pin jumper
LED Vin
JP2
2-pin jumper
CNTL
S1
SPDT switch
Remove jumper to measure Vin for efficiency. Replace jumper and LED lights
with PGOOD.
Shunts control pin to GND (turns off the IC for default configuration of
ON_OFF_CONFIG, refer to the Datasheet for details)
TSNS and SS Switch between external temperature sensor and SS resistor to be connected to
Switch
TSNS/SS pin
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EVM Configuration Using the Fusion GUI
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6 EVM Configuration Using the Fusion GUI
The TPS544B25 or TPS544C25 installed on this EVM leave the factory pre-configured. See Table 6-1 for a short
list of key factory configuration parameters as obtained from the configuration file.
Table 6-1. Key Factory Configuration Parameters
ADDRESS HEX
0x24
ADDRESS DEC
PART ID
36
TPS544x25
GENERAL
CMD Code
CMD CODE HEX
ENCODED HEX
DECODED
VIN_OFF
0x36
0xF010
4.0 V
Turn OFF voltage
VIN_ON
0x35
0xF012
4.5 V
Turn ON voltage
IOUT_CAL_OFFSET
0x39
0xE000
0.0000 A
0xF848
(TPS544C25)
36 A
0xF830
(TPS544B25)
24 A
IOUT_OC_FAULT_LIMIT
IOUT_OC_FAULT_RESPONSE
IOUT_OC_WARN_LIMIT
0x46
0x47
0x4A
COMMENTS
Current offset for GUI readout
OC fault level
0xBF
Restart
0xF844
(TPS544C25)
34 A
0xF82C
(TPS544B25)
22 A
Response to OC fault
OC warning level
VOUT_COMMAND
0x21
0x01E6
0.95 V
output voltage
VOUT_MAX
0x24
0x0300
1.5 V
maximum output voltage
VOUT_TRANSITION_RATE
0x27
0xD03C
1 mV/us
VOUT_SCALE_LOOP
0x29
0xF004
1
VOUT_OV_FAULT_LIMIT
0x40
0x0290
1.281 V
Output overvoltage fault threshold
VOUT_OV_FAULT_RESPONSE
0x41
0xBF
Restart
Output overvoltage fault response
VOUT_OV_WARN_LIMIT
0x42
0x0267
1.201 V
Output overvoltage warn threshold
VOUT_UV_WARN_LIMIT
0x43
0x0143
0.631 V
Output undervoltage warn threshold
VOUT_UV_FAULT_LIMIT
0x44
0x0130
0.594 V
Output undervoltage fault threshold
VOUT_UV_FAULT_RESPONSE
0x45
0xBF
Restart
Output undervoltage fault response
ON_OFF_CONFIG
0x02
0x16
CNTL only, Active High
OPERATION
0x01
0x00
Operation is not used to enable regulation; Unit:
immediate off
OT_FAULT_LIMIT
0x4F
0x007D
125°C
OT fault level
OT_WARN_LIMIT
0x51
0x0064
100°C
OT warn level
TON_DELAY
0x60
0x0000
0 ms
Turn-on delay
TON_RISE
0x61
0x0005
5 ms
Soft-start time
TON_MAX_FAULT_LIMIT
0x62
0x0064
100 ms
TOFF_DELAY
0x64
0x0000
0 ms
Turn-off delay
TOFF_FALL
0x65
0x0000
1 ms
Soft-stop fall time
MFR_VOUT_MIN
0xA4
0x0100
0.5 V
minimum output voltage
Vout transition rate
Output sense scaling ratio for main control loop
Control signal and operation command not
required
Upper limit for Vout reaching regulation
If it is desired to configure the EVM to settings other than the factory settings shown in Table 6-1, the TI Fusion
Digital Power Designer software can be used for reconfiguration. It is necessary to have input voltage applied
to the EVM prior to launching the software so that the TPS544B25 or TPS544C25 installed is active and able
to respond to the GUI and the GUI can recognize the device. The default configuration for the EVM is to start
converting at an input voltage of 4.5 V; therefore, to avoid any converter activity during configuration, an input
voltage less than 4.5 V must be applied. An input voltage of 4 V is recommended.
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EVM Configuration Using the Fusion GUI
6.1 Configuration Procedure
1.
2.
3.
4.
5.
Adjust the input supply to provide 4 VDC, current limited to 1 ADC.
Apply the input voltage to the EVM. See Figure 5-1 for overview of the EVM and its connections.
Launch the Fusion GUI software. See the screen shots in Section 9 for more information.
Configure the EVM operating parameters as desired.
VSET pin is pulled up to BP3 on the EVM, so the VOUT_COMMAND at boot up is restored from the internal
EEPROM. The SYNC/RESET_B pin is configured to SYNC function under this setup. In order to use VSET
or RESET_B function, proper resistor of R19 should be populated and resistor R18 should be removed.
Please see Datasheet for more details.
6. S1 on the EVM provides the option to use the external temperature sensor Q1 on the EVM.
Note
To read the external temprature value on PMBus, the bit 8 (SS_DET_DIS) in (E5h)
MFR_SPECIFIC _21 register needs to be set to 1. Otherwise, the READ_TEMPERATURE_2
will always return 25°C.
7. With an input of 4 VDC, the internal configuration circuitry will be powered and active but the device will still
be in UVLO and outputs off.
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Test Procedure
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7 Test Procedure
7.1 Line/Load Regulation Measurement Procedure
1. Ensure that the electronic load is set to draw 0 ADC.
2. Increase VIN from 0 V to 12 V using the digital multimeter to measure input voltage.
3. Use the other digital multimeter to measure output voltage VOUT at TP4 and TP5.
Table 7-1. List of Test Points for Line/Load Measurements
TEST POINT
NODE NAME
DESCRIPTION
JP1
VIN
Measurement point for VIN +VE (remove the jumper, LED will not light)
TP10
GND
Measurement point for VIN –VE
TP4
V_sense +
Measurement point for VOUT +VE
TP5
V_sense -
Measurement point for VOUT –VE
4. Vary the load from 0 ADC to maximum rated output ADC (TPS544B25 = 20 A, TPS544C25 = 30 A) . VOUT
must remain in regulation as defined in Table 3-1.
5. Vary VIN from 4.5 V to 18 V. VOUT must remain in regulation as defined in Table 3-1.
6. Decrease the load to 0 A.
7. Decrease VIN to 0 V or turn off the supply.
7.2 Efficiency
To measure the efficiency of the power train on the EVM, it is important to measure the voltages at the correct
location. This is necessary because otherwise the measurements will include losses in efficiency that are not
related to the power train itself. Losses incurred by the voltage drop in the copper traces and in the input and
output connectors are not related to the efficiency of the power train, and they must not be included in efficiency
measurements.
Table 7-2. List of Test Points for Efficiency Measurements
TEST POINT
NODE NAME
JP1
VIN
Measurement point for VIN +VE (remove the jumper, LED will not light)
DESCRIPTION
TP10
GND
Measurement point for VIN –VE
TP6
VOUT
Measurement point for VOUT +VE
TP10
GND
Measurement point for VOUT –VE
Input current can be measured at any point in the input wires, and output current can be measured anywhere
in the output wires of the output being measured. Using these measurement points result in efficiency
measurements that do not include losses due to the connectors and PCB traces.
7.3 Bode Plot Measurement Procedure
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Follow Section 7.1 to set VIN and Load to desired operating condition.
Connect the AC small signal injection out of isolation transformer to test points TP2 and TP3.
Connect input signal amplitude measurement probe (Channel A) to TP3.
Connect output signal amplitude measurement probe (Channel B) to TP2.
Connect ground lead of Channel A and Channel B to TP10.
Inject 10 mV or less signal through the isolation transformer.
Sweep the frequency from 500 Hz to 500 kHz with 10-Hz or lower post filter.
Control loop gain can be measured by 20 x log (ChannelB/ChannelA).
Control loop phase can be measured by the phase difference between Channel A and Channel B.
Follow Section 7.4 to power off the device.
7.4 Equipment Shutdown
1.
2.
3.
4.
10
Reduce the load current to 0 A.
Reduce input voltage to 0 V.
Shut down the external fan if in use.
Shut down equipment.
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Performance Data and Typical Characteristic Curves
8 Performance Data and Typical Characteristic Curves
Figure 8-1 through Figure 8-13 present typical performance curves for the PWR-681EVM.
8.1 Efficiency
100%
5 VIN
12 VIN
18 VIN
Efficiency (%)
90%
80%
70%
60%
0
3
6
9
12
15
18
21
Output Current (A)
24
27
30
D001
Figure 8-1. Efficiency of 0.95-V Output vs Line and Load
8.2 Load Regulation
0.96
5 VIN
12 VIN
18 VIN
0.958
0.956
Output Voltage (V)
0.954
0.952
0.95
0.948
0.946
0.944
0.942
0.94
0.938
0
3
6
9
12
15
18
21
Output Current (A)
24
27
30
D001
Figure 8-2. Load Regulation of 0.95-V Output
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8.3 Line Regulation
0.96
0-A Load
30-A Load
20-A Load
Output Voltage (V)
0.954
0.948
0.942
0.936
0.93
0
4
8
12
Input Voltage (V)
16
20
D001
Figure 8-3. Line Regulation of 0.95-V Output
8.4 Transient Response
Ch1 = VIN at 5 V/division, Ch3 = VOUT at 30 mV/division, Ch4 = IOUT at 10 A/division
Figure 8-4. Transient Response of 0.95-V Output at 12 VIN, Transient is 0 A to 20 A, 2.5 A/µs
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Performance Data and Typical Characteristic Curves
8.5 Output Ripple
Ch1 = SW at 5 V/division, Ch3 = VOUT ripple at 20 mV/division
Figure 8-5. Output Ripple and SW Node of 0.95-V Output at 12 VIN, 0-A Output
Ch1 = SW at 5 V/division, Ch3 = VOUT ripple at 20 mV/division
Figure 8-6. Output Ripple and SW Node of 0.95-V Output at 12 VIN, 20-A Output
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Performance Data and Typical Characteristic Curves
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8.6 Control On
Ch1 = VIN at 10 V/division, Ch2 = CNTL at 2 V/division, Ch3 = VOUT at 500 mV/division, Ch4 = PGOOD at 5 V/division
Figure 8-7. Start up from Control, 0.95-V Output at 12 VIN, 20-A Output
Ch1 = VIN at 10 V/division, Ch2 = CNTL at 2 V/division, Ch3 = VOUT at 500 mV/division, Ch4 = PGOOD at 5 V/division
Figure 8-8. 0.5-V Pre-biase start up from Control, 0.95-V Output at 12 VIN, 0-A Output
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Performance Data and Typical Characteristic Curves
8.7 Control Off
Ch1 = VIN at 10 V/division, Ch2 = CNTL at 2 V/division, Ch3 = VOUT at 500 mV/division, Ch4 = PGOOD at 5 V/division
Figure 8-9. Soft Stop from Control, 0.95-V Output at 12 VIN, 20-A Output
8.8 Overcurrent Protection
Ch1 = VIN at 10 V/division, Ch2 = IIN at 2 A/division, Ch3 = VOUT at 500 mV/division, Ch4 = IOUT at 10 A/division
Figure 8-10. Overcurrent Protection, 0.95-V Output at 12 VIN, 36-A Output
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Ch1 = VIN at 10 V/division, Ch2 = IIN at 2 A/division, Ch3 = VOUT at 500 mV/division, Ch4 = IOUT at 10 A/division
Figure 8-11. Restart from Overcurrent Protection, 0.95-V Output at 12 VIN
8.9 Control Loop Bode Plot
Figure 8-12. Bode Plot at 0.95-V Output at 12 VIN, 20-A Output
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Performance Data and Typical Characteristic Curves
8.10 Thermal Image
Figure 8-13. Thermal Image at 0.95-V Output at 12 VIN, 20-A Output
Figure 8-14. Thermal Image at 0.95-V Output at 12 VIN, 30-A Output
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Fusion GUI
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9 Fusion GUI
Figure 9-1. First Window at Fusion Launch
Device Found
Figure 9-2. Scan Finds Device Successfully
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Fusion GUI
Figure 9-3. Software Launch Continued
Figure 9-4. Software Launch Continued
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Fusion GUI
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Use this next screen to configure (Figure 9-5):
•
•
•
•
•
•
•
•
OV and UV Fault and Warn Limit
OC Fault and OC Warn Limit
OT Fault and OT Warn Limit
Fault Response
UVLO
On/Off Configuration
Sequencing
VOUT Command Voltage
Figure 9-5. First Screen After Successful Launch Configure: Limits and On/Off
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Fusion GUI
Changing the on/off configuration prompts a pop-up window with details of the options Figure 9-6).
Figure 9-6. Configure: Limits and On/Off- On/Off Configuration Pop-up
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Fusion GUI
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After a change is selected, orange U icon is displayed to offer Undo Change option. Change is not retained until
either Write to Hardware or Store Config to NVM is selected. When Write to Hardware is selected, change is
committed to volatile memory and defaults back to previous setting on input power cycle. When Store Config to
NVM is selected, change is committed to nonvolatile memory and becomes the new default (Figure 9-7).
Figure 9-7. Configure: Limits and On/Off- On/Off Config Pop-Up with Change
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Fusion GUI
Use "Advanced" tag to configure (Figure 9-8) :
•
•
E5h OPTIONS (MFR_SPECIFIC_21)
F0h MISC_CONFIG_OPTIONS options (MFR_SPECIFIC_32)
Figure 9-8. Configure: Advanced
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Fusion GUI
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The device information, User Scratch Pad, Write Protection options, the configuration of Vout Scale loop, Vout
Transition Rate and Iout Offset can be found on "Device Info" tag (Figure 9-9). The IOUT offset can be typed in or
scrolled to a new value. The range for IOUT cal offset is -4 A to 3.9375 A and the resolution step is 62.5 mA. If a
value is typed in that is between the available discrete steps, the typed-in value does not change but the nearest
discrete step is retained. The actual step is displayed on relaunch of the Fusion GUI.
Figure 9-9. Configure: Device Info
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Fusion GUI
The sources of SMBALERT which can be masked can be found and configured on the "SMBALERT # Mast"
screen (Figure 9-10)
Figure 9-10. Configure: SMBALERT # Mask
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Fusion GUI
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Use "All Config" tag to configure all of the configurable parameters (Figure 9-11). The screen also shows other
details like hexadecimal (hex) encoding.
Figure 9-11. Configure: All
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Fusion GUI
On/Off configuration can also be configured from the "All Config" screens, and the same process applies (Figure
9-12).
Figure 9-12. Configure: All Config- On/Off Config Pop-up
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Fusion GUI
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After making changes to one or more configurable parameters, the changes can be committed to nonvolatile
memory by selecting Store Config to NVM. This action prompts a confirm selection pop-up, and if confirmed, the
changes are committed to nonvolatile memory (Figure 9-13).
Figure 9-13. Configure: Store Config to NVM
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Fusion GUI
In the lower left corner, the different view screens can be changed. The view screens can be changed between
Configure, Monitor and Status as needed (Figure 9-14).
Figure 9-14. Change View Screen to Monitor Screen
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Fusion GUI
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When the Monitor screen is selected (Figure 9-15), the screen changes to display real-time data of the
parameters that are measured by the controller. This screen provides access to:
•
•
•
•
•
•
•
Graphs of VOUT, IOUT, and Temperature. As shown, Pout display is turned off.
Start/Stop polling which turns on or off the real-time display of data.
Clear Faults to clear any prior fault flags
Quick access to on/off configuration
Control pin activation, and operation command.
PMBus log which displays activity on the PMBus.
Tips and hints which displays additional information when the cursor is hovered over configurable
parameters.
At first GUI launch, faults may occur due to communications during power up. These faults can be cleared once
the device is enabled.
Figure 9-15. Monitor Screen
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Fusion GUI
Selecting System Dashboard from mid-left screen adds a new window which displays system-level information
(Figure 9-16).
Figure 9-16. System Dashboard
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Fusion GUI
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Selecting Status from lower left corner shows the status of the controller (Figure 9-17).
Figure 9-17. Status Screen
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Fusion GUI
Selecting the pull-down menu File- Import Project from the upper left menu bar can be used to configure
all parameters in the device at once with a desired configuration, or even revert back to a known-good
configuration. This action results in a browse-type sequence where the desired configuration file can be located
and loaded (Figure 9-18).
Figure 9-18. Import Project / Import Configuration File
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Fusion GUI
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Selecting Store User Configuration to Flash Memory from the device pull-down menu has the same functionality
as the Store Config to NVM button from the configure screen. It results in committing the current configuration to
nonvolatile memory (Figure 9-19).
Figure 9-19. Store Configuration To Memory
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Fusion GUI
Select Data Logging (Figure 9-20), from the Tools drop-down menu. This enables logging of common operating
values such as VOUT, IOUT, and temperature. The user is prompted to select a location for the file to be stored as
well as the type of file. Select the storage location for the file and the type of file. Logging begins when the Start
Data Logging button is selected, and stops when it is reselected.
Figure 9-20. Data Logging
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Fusion GUI
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Common contents of the data log as shown in (Figure 9-21).
Figure 9-21. Data Log File
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Fusion GUI
Selecting PMBus Logging (Figure 9-22) from the Tools drop-down menu enables the logging of all PMBus
activity in the same way as the datalogging. This includes communications traffic for each polling loop between
the GUI and the device. It also includes common operating values such as VOUT, IOUT, and temperature. The
user is prompted to select a location for the file to be stored. See next screen (Figure 9-23).
Figure 9-22. PMBus Logging
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Fusion GUI
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Select the storage location for the file and the type of file. As shown (Figure 9-23), the file is a CSV file to be
stored in the directory path shown. Logging begins when the Start Logging button is selected, and stops when it
is reselected (as Stop Logging). This file can rapidly grow in size, so caution is advised when using this function.
Figure 9-23. PMBus Log Details
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EVM Assembly Drawing and PCB Layout
10 EVM Assembly Drawing and PCB Layout
Figure 10-1 through Figure 10-6 show the design of the PWR-681EVM printed-circuit board (PCB).
Figure 10-1. PWR-681EVM Top Layer Assembly Drawing (top view)
Figure 10-2. PWR-681EVM Top Layer (top view)
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EVM Assembly Drawing and PCB Layout
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Figure 10-3. PWR-681EVM Layer 1 (top view)
Figure 10-4. PWR-681EVM Layer 2 (top view)
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EVM Assembly Drawing and PCB Layout
Figure 10-5. PWR-681EVM Bottom Layer (top view)
Figure 10-6. PWR-681EVM Bottom Layer Assembly Drawing (top view)
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List of Materials
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11 List of Materials
The EVM components list according to the schematic shown in Table 11-1.
Note
TPS544C25 version used for this example. The TPS544B25 EVM has the same List of Material as the
TPS544C25 EVM with the exception of U1.
Table 11-1. PWR681 List of Materials
QTY
42
DES
DESCRIPTION
MANUFACTURER
PART NUMBER
1
PCB
Printed Circuit Board
Any
PWR681
1
C1
Capacitor, ceramic, 33 pF, 100 V, ±5%, C0G/NP0, 0603
AVX
06031A330JAT2A
2
C2, C10
Capacitor, ceramic, 1000 pF, 100 V, ±5%, X7R, 0603
AVX
06031C102JAT2A
2
C3, C4
Capacitor, ceramic, 1200 pF, 50 V, ±5%, C0G/NP0, 0603
TDK
C1608C0G1H122J
1
C5
Capacitor, ceramic, 330 pF, 50 V, ±1%, C0G/NP0, 0603
TDK
C1608C0G1H331F080A
A
1
C6
Capacitor, ceramic, 1 µF, 25 V, ±10%, X7R, 0603
MuRata
GRM188R71E105KA12D
1
C7
Capacitor, ceramic, 4.7 µF, 10 V, ±10%, X5R, 0603
Kemet
C0603C475K8PACTU
1
C8
Capacitor, ceramic, 2.2 µF, 6.3 V, ±10%, X6S, 0402
MuRata
GRM155C80J225KE95D
1
C9
Capacitor, ceramic, 0.1 µF, 25 V, ±5%, X7R, 0603
Kemet
C0603C104J3RACTU
7
C11, C12, C21,
C22, C23, C27,
C28
Multi-layer ceramic capacitor, 100 µF, 6.3 V, X5R, 1210
Wurth
885012109004
4
C13, C14, C15,
C16
Multi-layer ceramic capacitor, 22 µF, 25 V, X5R, 1210
Wurth
885012109014
2
C17, C18
Capacitor, ceramic, 6800 pF, 25 V, ±10%, X7R, 0402
MuRata
GRM155R71E682KA01D
2
C19, C20
Capacitor, ceramic, 22 µF, 6.3 V, ±20%, X5R, 0805
MuRata
GRM21BR60J226ME39L
1
C24
Capacitor, TA, 100 µF, 25 V, ±10%, 0.1 Ω, SMD
AVX
TPSV107K025R0100
1
D1
LED, pink, SMD
Bivar
SMS1105PKD
4
H1, H2, H3, H4
Bumpon, cylindrical, 0.312 X 0.200, black
3M
SJ61A1
2
H5, H6
Screw, 6-32 x 3/8" steel
B&F Fastener Supply
PMSSS 632 0038 PH
1
J1
2-pin terminal block, 0.200” spacing
Wurth
691216510002
1
J2
10-pin header, 2x5, 0.100” spacing, shrouded
Wurth
61201021621
2
J3, J4
Swage threaded standoff, brass, swage mount, TH
Keystone
1546
2
JP1, JP2
2-pin header, 0.100” spacing
Wurth
61300211121
1
L1
Inductor, shielded drum core, ferrite, 470 nH, 35 A,
0.00032 Ω, SMD
Wurth Elektronik
eiSos
744301047
1
LBL1
Thermal transfer printable labels, 0.650" W x 0.200" H 10,000 per roll
Brady
THT-14-423-10
1
Q1
Transistor, NPN, 40 V, 0.2 A, SOT-23
Fairchild
Semiconductor
MMBT3904
1
Q2
MOSFET, N-Channel, 60 V, 0.24 A, SOT-23
Vishay-Siliconix
2N7002E-T1-E3
1
R1
Resistor, 100 kΩ, 1%, 0.1 W, 0603
STD
STD
1
R2
Resistor, 10.5 kΩ, 1%, 0.1 W, 0603
STD
STD
4
R3, R5, R10,
R18
Resistor, 10.0 kΩ, 1%, 0.1 W, 0603
STD
STD
3
R6, R13, R15
Resistor, 49.9 Ω, 1%, 0.1 W, 0603
STD
STD
1
R7
Resistor, 40.2 kΩ, 1%, 0.1 W, 0603
STD
STD
1
R8
Resistor, 300 Ω, 1%, 0.1 W, 0603
STD
STD
2
R11, R12
Resistor, 51.1 kΩ, 1%, 0.1 W, 0603
STD
STD
1
R14
Resistor, 0 Ω, 5%, 0.1 W, 0603
STD
STD
1
R16
Resistor, 1.0 Ω, 5%, 0.25 W, 1206
STD
STD
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Revision History
Table 11-1. PWR681 List of Materials (continued)
QTY
DES
DESCRIPTION
MANUFACTURER
PART NUMBER
1
R17
Resistor, 0 Ω, 5%, 0.1 W, 0603
STD
STD
1
R20
Resistor, 21.5, 1%, 0.1 W, 0603
STD
STD
1
R21
Resistor, 38.3 kΩ, 1%, 0.1 W, 0603
STD
STD
1
S1
Switch, slide, SPDT 100 mA, SMT
Copal Electronics
CAS-120TA
2
SH-JP1, SHJP2
Shunt, 100 mil, gold plated, black
3M
969102-0000-DA
6
TP1, TP7, TP8,
TP9, TP11,
TP12
Test point, miniature, white, TH
Keystone
5002
5
TP2, TP3, TP4,
TP6, TP13
Test point, miniature, red, TH
Keystone
5000
2
TP5, TP14
Test point, miniature, black, TH
Keystone
5001
1
TP10
Test point, multipurpose, black, TH
Keystone
5011
1
U1
18 V, 30 A PMBUS Synchronous Buck Converters,
RVF0040A
Texas Instruments
TPS544C25RVF
1
U2
3-Terminal Adjustable Current Source, 8-pin Narrow SOIC, Texas Instruments
Pb-Free
LM334SM/NOPB
0
C25, C26
Capacitor, TA, 330 µF, 6.3 V, ±20%, 0.025 Ω, SMD
Sanyo
6TPE330ML
0
FID1, FID2,
FID3, FID4,
FID5, FID6
Fiducial mark. There is nothing to buy or mount.
N/A
N/A
0
R4
Resistor, 0 Ω, 5%, 0.1 W, 0603
Panasonic
ERJ-3GEY0R00V
0
R9, R19
Resistor, 30.1 kΩ, 1%, 0.1 W, 0603
Vishay-Dale
CRCW060330K1FKEA
12 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (September 2015) to Revision B (August 2021)
Page
• Updated the numbering format for tables, figures, and cross-references throughout the document. ................3
• Updated the user's guide title............................................................................................................................. 3
Changes from Revision * (May 2015) to Revision A (September 2015)
Page
• Added updated EVM Assembly Drawings and PCB Layout drawings............................................................. 39
• Changed C11, C12, C21, C22, C23, C27, C28 description, manufacturer and part number........................... 42
• Changed C13, C14, C15, C16 description, manufacturer and part number. ................................................... 42
• Changed J1 description, manufacturer and part number..................................................................................42
• Changed J2 description, manufacturer and part number..................................................................................42
• Changed JP1 and JP2 description, manufacturer and part number................................................................. 42
• Changed L1 part number.................................................................................................................................. 42
• Changed all resistor manufacturer and part numbers to STD. ........................................................................ 42
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