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Table of Contents
User’s Guide
TPS53515 Step-Down Converter Evaluation Module User's
Guide
Table of Contents
1 Introduction.............................................................................................................................................................................2
2 Description.............................................................................................................................................................................. 2
2.1 Typical Applications............................................................................................................................................................2
2.2 Features............................................................................................................................................................................. 2
3 Electrical Performance Specifications................................................................................................................................. 2
4 Schematic................................................................................................................................................................................3
5 Test Setup................................................................................................................................................................................4
5.1 Test Equipment.................................................................................................................................................................. 4
5.2 Recommended Test Setup.................................................................................................................................................5
6 Configurations........................................................................................................................................................................ 6
6.1 Switching Frequency Selection.......................................................................................................................................... 6
6.2 Mode Selection.................................................................................................................................................................. 6
6.3 VDD Pin Supply Selection..................................................................................................................................................6
7 Test Procedure........................................................................................................................................................................ 7
7.1 Line and Load Regulation and Efficiency Measurement Procedure.................................................................................. 7
7.2 Control-Loop Gain and Phase-Measurement Procedure...................................................................................................7
7.3 List of Test Points............................................................................................................................................................... 8
7.4 Equipment Shutdown......................................................................................................................................................... 8
8 EVM Assembly Drawing and PCB Layout............................................................................................................................ 9
9 Bill of Materials..................................................................................................................................................................... 13
10 Revision History................................................................................................................................................................. 14
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1
Introduction
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1 Introduction
The TPS53515EVM-PWR587 evaluation module (EVM) uses the TPS53515 device. The TPS53515 device is a
D-CAP3™ mode, 12-A synchronous buck-converter with integrated MOSFETs. The device provides a fixed 1.2-V
output at up to 12 A from a 12-V input bus.
2 Description
The TPS53515EVM-PWR587 is designed for a regulated 12-V bus to produce a regulated 1.2-V output at up to
12 A of load current. The TPS53515EVM-PWR587 is designed to demonstrate the TPS53515 device in a typical
low-voltage application while providing a number of test points to evaluate the performance of the TPS53515
device.
2.1 Typical Applications
•
•
•
Servers and storage
Workstations and desktops
Telecommunication infrastructure
2.2 Features
The TPS53515EVM-PWR587 features include the following:
• 12-A DC steady-state output current
• Support for a prebias-output voltage at startup
• Jumper, J2, for enable function
• Jumper, J5, for auto-skip and forced-continuous-conduction-mode (FCCM) selection
• Jumper, J7, for extra 5-V input for further power saving purpose
• Convenient test points for probing critical waveforms
3 Electrical Performance Specifications
Table 3-1. TPS53515EVM-PWR587 Electrical Performance Specifications(1)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
5
12
18
UNITS
Input Characteristics
Voltage range
VIN
Maximum input current
VIN = 5 V, IO = 8 A
No load input current
VIN = 12 V, IO = 0 A with auto-skip mode
2.5
V
A
1
mA
Output Characteristics
Output voltage VOUT
Output voltage regulation
Output voltage ripple
1.2
Line regulation (VIN = 5 V – 14 V) with FCCM
0.2
Load regulation (VIN = 12 V, IO = 0 A – 8 A) with FCCM
0.5
VIN = 12 V, IO = 8 A with FCCM
Output load current
Soft-start
%
10
0
Output over current
V
mVpp
12
A
15
A
1
ms
Systems Characteristics
Switching frequency
VIN = 12 V, 1.2 V / 4 A
1000
kHz
Peak efficiency
VIN = 12 V, 1.2 V / 8 A
88.5
%
86.9
%
25
°C
Full load efficiency
Operating temperature
(1)
2
Jumpers set to default locations, See Section 6.
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Schematic
4 Schematic
LabView
PGOOD
VR
EG
VREG
1 PGND
2 SW
PGOOD
1
2
3
4
5
6
7
8
9
10
R11
20.0k
R12
150k
R13
150k
C34
onnector
5
6
7
8
9
10
VR
EG
C18
1uF
C26
1uF
SW
VDD
VIN
VOUT
VDD
VIN
VOUT
J6
VDD_19 PEC05DAAN
MODE
TP14
J5
PEC05DAAN
AGND
CHB
C25
1uF
VDD
PGND
TP13
VREG
CHA
TP5
C20
1uF
MODE
PGND
MODE
VDD
FB
TP8
VDD
VOUT
2
R16
1
VOUT
R22
10
R20
10.0k
R21
10.0k
2
1
R19
0
Ext. VDD
1
J7
ED555/2
DS
PGND
AGND
VIN
15
16
17
VIN
TP1
VIN
U1
TPS53515RVE
VIN
VIN
18
NC
VIN
19
VDD
21
20
VREG
MODE
23
FB
AGND
22
FB
TRIP
TP11
2
24
25
VO
TRIP
1
29
C4
22uF
C24
C27
DNP
DNP
1
2
1
J1
ED120/2
DS
Input: 814V
11
PGND
28
C3
22uF
12
PGND
27
R10
57.6k
C2
22uF
13
PGND
26
C1
22uF
C5
0.1uF
14
PGND
10
PGND
TP4
PW
PGND
PGND
SW
SW
CLK
VREG
TP2
R4
300k
R15
0
1
PGOOD
TP3
VR
EG
onnector
DNP
R7
VDD
AGND
2
C6
22uF
C19
22uF
C21
22uF
C22
22uF
C23
22uF
VDD
R9
3.01
R1
100k
1
2
J2
AGND
C16
FB
1
DNP
2
2
FB
1
2
Output: 1.2V/0-12A
1
J3
ED120/2
DS
VOUT
TP9
VOUT
PGND
PEC02SAAN
OPEN= ENABLE
PGND
C10
22uF
R8
0
C15
DNP
DNP
TP12
R6
200k
TP15
VOUT
DNP
C17
EN
TP7
C9
C8
470pF
PGOOD
AGND
VOUT
2
2
1
R2
100k
AGND
1
L1
.0 uH
R5
0
C7
0.1uF
VREG
R14
0
L1A
DNP
SW
VOUT
DATA
DNP
2
9
8
7
6
5
4
3
2
TP6
1
AGND
1
SW
SW
SW
NC
SW
PGND
R3
1.00k
J4
PEC05DAAN
PM
Bus C
VBST
TP10
EN
ADDR/RF
VREG
ALERT#
1
VR
EG
PGOOD
AGND
PGOOD
DNP
1
2
3
4
5
6
7
8
9
10
ADDR/RF
PD
C11
22uF
C12
22uF
C13
22uF
C14
22uF
AGND
PGND
NOTES:
1
VARIANT PINOUT FOR U1
TABLE 1
IC
TPS53915 TPS53513 TPS53515
PIN 26
ALERT#
NC
NC
PIN 27
SDA
GND1
GND1
PIN 28
SCL
GND2
GND2
Figure 4-1. TPS53515EVM-PWR587 Schematic
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3
Test Setup
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5 Test Setup
5.1 Test Equipment
Oscilloscope
A digital or analog oscilloscope measures the output ripple. The oscilloscope must be set for
the following: 1-MΩ impedance, 20-MHz bandwidth, AC coupling, 1-µs / division horizontal
resolution, 20-mV / division vertical resolution. Test points TP7 and TP9 measure the output
ripple voltage by placing the oscilloscope probe tip through TP7 and holding the ground barrel
on TP9 as shown in Figure 5-1. Using a leaded ground connection can induce additional noise
due to the large ground loop.
Voltage Source The input voltage source VIN must be a 0 to 14-V variable-DC source capable of supplying 10
ADC. Connect VIN to J1 as shown in Figure 5-2.
Multimeters
V1: VIN at TP1 (VIN) and TP4 (GND).
V2: VOUT at TP7 (VOUT) and TP9 (GND).
Output Load
The output load must an electronic constant-resistance-mode load capable of 0 to 15 ADC at
1.2 V.
Metal Ground Barrel
Probe Tip
TP7
TP9
Figure 5-1. Tip and Barrel Measurement for VOUT Ripple
Recommended Wire Gauge:
1. VIN to J1 (12-V input)
• The recommended wire size is 1× AWG number 14 per input connection, with the total length of wire less
than 4 feet (2 feet input, 2 feet return).
2. J3 to LOAD
• The minimum recommended wire size is 2× AWG number 14, with the total length of wire less than 4 feet
(2 feet output, 2 feet return).
4
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Test Setup
5.2 Recommended Test Setup
Figure 5-2. TPS53515EVM-587 Top Layer for Test Setup
Input Connections:
1. Prior to connecting the DC input-source, VIN, TI recommends to limit the source current from VIN to 10 A
maximum. Ensure that VIN is initially set to 0 V and connected as shown in Figure 5-2.
2. Connect the voltmeter V1 at TP1 (VIN) and TP4 (GND) to measure the input voltage.
Output Connections:
1. Connect the load to J3 and set the load to constant-resistance-mode to sink 0 ADC before VIN is applied.
2. Connect the voltmeter V2 at TP7 (VOUT) and TP9 (GND) to measure the output voltage.
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5
Configurations
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6 Configurations
All Jumper selections must be made prior to applying power to the EVM. Configure this EVM using the following
configuration selections.
6.1 Switching Frequency Selection
Switching frequency can be changed as shown in Table 6-1.
Table 6-1. Switching Frequency Selection
(1)
EXAMPLE RF FREQUENCY
COMBINATIONS
SWITCHING
FREQUENCY(1)
(ƒSW) (kHz)
RESISTOR DIVIDER RATIO
(RDR)
RRF_H (kΩ)
RRF_L (kΩ)
1000
> 0.557
1
300
850
0.461
180
154
750
0.375
200
120
600
0.297
249
105
500
0.229
240
71.5
400
0.16
249
47.5
300
0.096
255
27
200
< 0.041
270
11.5
Default Setting: 1 MHz.
For different switching frequency setting, please change R3 and R4 as shown in Table 6-1.
6.2 Mode Selection
The MODE can be set by J5.
Table 6-2. Mode Selection
JUMPER SET TO:
(1)
(2)
MODE SELECTION
1 to 2 pin shorted
FCCM with 2x RC time constant
3 to 4 pin shorted(1)
FCCM(2) with 1x RC time constant(1)
5 to 6 pin shorted
FCCM(2) with 2x RC time constant
7 to 8 pin shorted
Auto-skip mode with 2× RC time constant
9 to 10 pin shorted
Auto-skip mode with 1× RC time constant
Default setting.
The device enters FCCM after PGOOD goes high.
6.3 VDD Pin Supply Selection
The controller can be enabled and disabled by J7.
Table 6-3. Enable Selection
SET ON CONNECTION
VDD pin connected to VIN pins(1)
R19 = Open
VDD pin disconnected to VIN pins
R19 = 0
(1)
ENABLE SELECTION
Ω(1)
Default setting: the VDD pin connected to the VIN pins through R19.
For power-up, input J7 with proper voltage. The VDD pin input voltage range is from 4.5 V to 25 V.
6
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Test Procedure
7 Test Procedure
7.1 Line and Load Regulation and Efficiency Measurement Procedure
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Set up the EVM as described in Section 5 and Figure 5-2.
Ensure the load is set to constant-resistance mode and to sink at 0 ADC.
Ensure all jumper setting are configured as shown in Section 6.
Ensure the jumper provided in the EVM shorts on J2 before VIN is applied.
Increase VIN from 0 to 12 V. Use V1 to measure input voltage.
Remove the jumper on J2 to enable the controller.
Use V2 to measure the VOUT voltage.
Vary the load from 0 to 10 ADC, VOUT must remain in load regulation.
Vary VIN from 8 to 14 V, VOUT must remain in line regulation.
To disable the converter, place the jumper on J2.
Decrease the load to 0 A
Decrease VIN to 0 V.
7.2 Control-Loop Gain and Phase-Measurement Procedure
The TPS53515EVM-PWR587 contains a 10-Ω series resistor in the feedback loop for loop response analysis.
1. Set up the EVM as described in Section 5 and Figure 5-2.
2. Connect the isolation transformer to the test points marked TP5 and TP8.
3. Connect the input-signal amplitude-measurement probe (channel A) to TP10. Connect the output-signal
amplitude-measurement probe (channel B) to TP11.
4. Connect the ground lead of channel A and channel B to TP15.
5. Inject around 20 mV or less signal through the isolation transformer.
6. To measure control-loop gain and phase margin, change the frequency from 100 Hz to 1 MHz using a 10-Hz
or less post filter.
7. Disconnect the isolation transformer from the bode-plot test points before making other measurements.
• Signal injection into feedback can interfere with the accuracy of other measurements.
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Test Procedure
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7.3 List of Test Points
Table 7-1. Test Point Functions
TEST POINTS
NAME
TP1
VIN
DESCRIPTION
Converter input supply voltage
TP2
VREG
TP3
PGOOD
TP4
PGND
TP5
CHB
Input B for loop injection
TP6
SW
Switch Node
TP7
VOUT
TP8
CHA
TP9
PGND
TP10
RF
TP11
TRIP
LDO voltage
Power good output
Power ground
VOUT terminal +
Input A for loop injection
Power ground
RF pin
TRIP pin
TP12
EN
TP13
VDD
Enable pin
TP14
MODE
MODE pin
TP15
AGND
Analog ground
VDD pin
7.4 Equipment Shutdown
Follow these steps when shutting down the equipment.
1. Shut down load
2. Shut down VIN
8
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EVM Assembly Drawing and PCB Layout
8 EVM Assembly Drawing and PCB Layout
The following figures show the design of the TPS53515EVM-PWR587 printed circuit board (see Figure 8-1,
Figure 8-2, Figure 8-3, Figure 8-4, Figure 8-5, Figure 8-6, Figure 8-7, and Figure 8-8). The EVM has been
designed using a six-layer, 2-oz copper-circuit board.
Figure 8-1. TPS53515EVM-587 Top-Layer Assembly Drawing
Figure 8-2. TPS53515EVM-587 Bottom-Layer Assembly Drawing
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EVM Assembly Drawing and PCB Layout
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Figure 8-3. TPS53515EVM-587 Top Layer, Copper
Figure 8-4. TPS53515EVM-587 Layer Two, Copper
10
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EVM Assembly Drawing and PCB Layout
Figure 8-5. TPS53515EVM-587 Layer Three, Copper
Figure 8-6. TPS53515EVM-587 Layer Four, Copper
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EVM Assembly Drawing and PCB Layout
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Figure 8-7. TPS53515EVM-587 Layer Five, Copper
Figure 8-8. TPS53515EVM-587 Bottom Layer, Copper
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Bill of Materials
9 Bill of Materials
Table 9-1. EVM Components List (Based on the Schematic, See Figure 4-1)
Designator
Quantity
Value
Description
Package Reference
Part Number
Manufacturer
C1, C2, C3, C4
4
22 µF
Capacitor, Ceramic, 25 V, X5R, 10%
1206
GRM31CR61E226KE15L
Murata
C5
1
0.1 µF
CAP CER 0.1 µF 25 V 10% X5R 0402
0402
GRM155R61E104KA87D
Murata
C6, C10, C11, C12,
C13, C14, C19, C21, 10
C22, C23
22 µF
Capacitor, Ceramic, 6.3 V, X5R, 20%
1206
GRM31CR60J226KE19L
Murata
C7
1
0.1 µF
CAP CER 0.1 µF 50 V 10% X7R 0603
0603
GRM188R71H104KA93D
Murata
C8
1
470 pF
CAP CER 470 pF 50 V 10% X7R 0603
0603
GRM188R71H471KA01D
Murata
C9, C17
0
Open
Capacitor, Ceramic, 50 V, X7R, 10%
0603
Standard
Standard
C15, C16, C24, C27
0
Open
Capacitor, POSCAP, SMT, 2.5 V, 330 µF, 8 mΩ
7343(D)
2R5TPE330M9 or 6TPE330MIL
Sanyo
C18, C20, C25, C26
4
1 µF
CAP CER 1 µF 16 V 10% X7R 0603
0603
GRM188R71C105KA12J
Murata
FID1, FID2, FID3,
FID4, FID5, FID6
0
Fiducial mark. There is nothing to buy or mount.
Fiducial
N/A
N/A
J1, J3
2
ED120/2DS
Terminal Block, 2-pin, 15-A, 5,1 mm
0.4 × 0.35 inch
ED120/2DS
OST
J2
1
PEC02SAAN
Header, Male 2-pin, 100-mil spacing,
0.1 × 2 inch
PEC02SAAN
Sullins
J4, J5, J6
3
PEC05DAAN
Header, Male 2×5-pin, 100-mil spacing
0.1 × 2 × 5 inch
PEC05DAAN
Sullins
J7
1
ED555/2DS
Terminal Block, 2-pin, 6-A, 3,5 mm
0.27 × 0.25 inch
ED555/2DS
OST
L1
1
1 µH
Inductor, Power Chokes SMD
6,6 × 7,1 mm
PIMB065T-1R0MS
Cyntec
L1A
0
DNP
Inductor, High Fq Power, ±15%
0.283 × 0.433 inch
69P987xN
Vitec
LBL1
1
Thermal Transfer Printable Labels, 0.650 (W) × 0.2 inch (H) — 10,000 PCB Label
per roll
0.65 (H) × 0.2 inch (W)
THT-14-423-10
Brady
R1, R2, R14, R15
4
100k
RES, 100 kΩ, 1%, 0.1 W, 0603
0603
CRCW0603100KFKEA
Vishay-Dale
R3
1
1k
RES, 1 kΩ, 1%, 0.1 W, 0603
0603
CRCW06031K00FKEA
Vishay-Dale
R4
1
300k
RES, 300 kΩ, 1%, 0.1 W, 0603
0603
RC0603FR-07300KL
Yageo America
R5, R8, R19
3
0
RES, 0 Ω, 5%, 0.1 W, 0603
0603
CRCW06030000Z0EA
Vishay-Dale
R6
1
200k
RES, 200 kΩ, 1%, 0.1 W, 0603
0603
CRCW0603200KFKEA
Vishay-Dale
R7
0
Open
Resistor, Chip, 1/16 W, 1%
0603
Standard
Standard
R9
1
3.01
RES, 3.01 Ω, 1%, 0.125 W, 0805
0805
CRCW08053R01FKEA
Vishay-Dale
R10
1
57.6k
RES, 57.6 kΩ, 1%, 0.1 W, 0603
0603
RC0603FR-0757K6L
Yageo America
R11
1
20k
RES, 20.0 kΩ, 1%, 0.1 W, 0603
0603
CRCW060320K0FKEA
Vishay-Dale
R12, R13
2
150k
RES, 150 kΩ, 1%, 0.1 W, 0603
0603
CRCW0603150KFKEA
Vishay-Dale
R16
1
1
RES, 1 Ω, 1%, 0.1 W, 0603
0603
CRCW06031R00FKEA
Vishay-Dale
R20, R21
2
10k
RES, 10 kΩ, 1%, 0.1 W, 0603
0603
CRCW060310K0FKEA
Vishay-Dale
R22
1
10
RES, 10 Ω, 1%, 0.1 W, 0603
0603
CRCW060310R0FKEA
Vishay-Dale
TP1, TP2, TP3, TP5,
TP6, TP7, TP8,
13
TP10, TP11, TP12,
TP13, TP14, TP15
5000
Test Point, Red, Thru Hole Color Keyed
0.1 × 0.1 inch
5000
Keystone
TP4, TP9
5001
Test Point, Black, Thru Hole Color Keyed
0.1 × 0.1 inch
5001
Keystone
TPS53515RVE
IC, High Performance, 12-A Single Sync. Step-Down Converter with
PMBus.
TPS53515RVE
TI
U1
2
1
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Revision History
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10 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (February 2014) to Revision C (May 2021)
Page
• Changed user's guide title.................................................................................................................................. 2
• Updated the numbering format for tables, figures, and cross-references throughout the document. ................2
Changes from Revision A (December 2013) to Revision B (February 2014)
Page
• Changed the test points in the Tip and Barrel Measurement for VOUT Ripple image from TPS5 and TPS7 to
TPS7 and TPS9 (respectively from left to right)................................................................................................. 4
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