Texas Instruments TPS543C20EVM-054 User Manual
User's Guide
SLUUBW8–July 2018
TPS543C20EVM-054 40-A Single Phase Synchronous
Step-Down Converter
This user's guide describes the characteristics, operation, and use of the TPS543C20EVM-054 evaluation
module (EVM). The user's guide includes test information, descriptions, and results. A complete schematic
diagram, printed-circuit board layouts, and bill of materials are also included in this document. Throughout
this user's guide, the abbreviations EVM, TPS543C20EVM-054, and the term evaluation module are
synonymous with the TPS543C20EVM-054, unless otherwise noted.
Contents
1 Introduction ................................................................................................................... 3
1.1 Before You Begin ................................................................................................... 3
2 Description.................................................................................................................... 4
2.1 Typical End-User Applications .................................................................................... 4
2.2 EVM Features....................................................................................................... 4
3 EVM Electrical Performance Specifications .............................................................................. 4
4 Schematic..................................................................................................................... 5
5 Test Equipment .............................................................................................................. 6
6 BSR054EVM ................................................................................................................. 7
7 List of Test Points, Jumpers, and Switch................................................................................. 8
8 Test Procedure............................................................................................................... 9
8.1 Line and Load Regulation Measurement Procedure........................................................... 9
8.2 Efficiency............................................................................................................. 9
8.3 Equipment Shutdown ............................................................................................. 10
9 Performance Data and Typical Characteristic Curves................................................................. 10
9.1 Efficiency ........................................................................................................... 10
9.2 Power Loss......................................................................................................... 10
9.3 Load Regulation ................................................................................................... 11
9.4 Transient Response............................................................................................... 11
9.5 Output Ripple ...................................................................................................... 12
9.6 Control On.......................................................................................................... 13
9.7 Control On and Off ................................................................................................ 14
9.8 Thermal Image..................................................................................................... 15
10 EVM Assembly Drawing and PCB Layout .............................................................................. 16
11 List of Materials............................................................................................................. 26
1 BSR054EVM Schematic.................................................................................................... 5
2 BSR054EVM Overview ..................................................................................................... 7
3 Tip and Barrel Measurement............................................................................................... 7
4 Efficiency of 0.9-V Output vs Load....................................................................................... 10
5 Power Loss of 0.9-V Output vs Load .................................................................................... 10
6 Load Regulation of 0.9-V Output......................................................................................... 11
7 Transient Response of 0.9-V Output at 12-VIN, Transient is 15 A to 25 A to 15 A, the Step is 10 A at 40
A/µs .......................................................................................................................... 11
8 Output Ripple and SW Node of 0.9-V Output at 12-V
9 Output Ripple and SW Node of 0.9-V Output at 12-V
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List of Figures
, 40-A Output............................................... 12
IN
, 0-A Output ................................................ 12
IN
TPS543C20EVM-054 40-A Single Phase Synchronous Step-Down Converter
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10 Start up from Control, 0.9-V Output at 12-V
11 0.5-V Pre-bias start up from Control, 0.9-V Output at 12-V
12 Output Voltage Start-up and Shutdown, 0.9-V Output at 12-V
13 Thermal Image at 0.9-V Output at 12 V
14 BSR054EVM Top Layer Assembly Drawing (Top View).............................................................. 16
15 BSR054EVM Top Solder Mask (Top View)............................................................................. 17
16 BSR054EVM Top Layer (Top View)..................................................................................... 18
17 BSR054EVM Inner Layer 1 (Top View) ................................................................................. 19
18 BSR054EVM Inner Layer 2 (Top View) ................................................................................. 20
19 BSR054EVM Inner Layer 3 (Top View) ................................................................................. 21
20 BSR054EVM Inner Layer 4 (Top View) ................................................................................. 22
21 BSR054EVM Bottom Layer (Top View)................................................................................. 23
22 BSR054EVM Bottom Solder Mask (Top View)......................................................................... 24
23 BSR054EVM Bottom Overlay Layer (Top View)....................................................................... 25
1 BSR054EVM Electrical Performance Specifications.................................................................... 4
2 Test Point Functions ........................................................................................................ 8
3 List of Test Points for Line and Load Measurements................................................................... 9
4 List of Test Points for Efficiency Measurements......................................................................... 9
5 BSR054EVM List of Materials ............................................................................................ 26
Trademarks
All trademarks are the property of their respective owners.
, 10-mA Output ........................................................ 13
IN
, 20-A Output......................................... 13
IN
, 0.5-A Output .................................... 14
IN
, 40-A Output, at 25°C Ambient.......................................... 15
IN
List of Tables
2
TPS543C20EVM-054 40-A Single Phase Synchronous Step-Down Converter
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1 Introduction
The BSR054EVM evaluation module uses the TPS543C20EVM-054 device. The TPS543C20EVM-054 is
a highly integrated synchronous buck converter that is designed for up to 40-A current output.
1.1 Before You Begin
The following warnings and cautions are noted for the safety of anyone using or working close to the
TPS543C20EVM-054. Observe all safety precautions.
The circuit module has signal traces, components, and component
leads on the bottom of the board. This may result in exposed
voltages, hot surfaces or sharp edges. Do not reach under the
board during operation.
Introduction
Warning The TPS543C20EVM-054 circuit module may become hot
during operation due to dissipation of heat. Avoid contact with
the board. Follow all applicable safety procedures applicable
to your laboratory.
Caution Do not leave the EVM powered when unattended.
WARNING
CAUTION
The circuit module may be damaged by over temperature. To avoid damage,
monitor the temperature during evaluation and provide cooling, as needed, for
your system environment.
CAUTION
Some power supplies can be damaged by application of external voltages. If
using more than 1 power supply, check your equipment requirements and use
blocking diodes or other isolation techniques, as needed, to prevent damage to
your equipment.
CAUTION
The communication interface is not isolated on the EVM. Be sure no ground
potential exists between the computer and the EVM. Also be aware that the
computer is referenced to the Battery- potential of the EVM.
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Description
2 Description
The BSR054EVM is designed as a single output DC/DC converter that demonstrates the
TPS543C20EVM-054 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 0.9-V output at up to
40-A load current.
2.1 Typical End-User Applications
• Enterprise storage, SSD, NAS
• Wireless and wired communication infrastructure
• Industrial PCs, automation, ATE, PLC, video surveillance
• Enterprise server, switches, routers
• ASIC, SoC, FPGA, DSP core and I/O rails
2.2 EVM Features
• Regulated 0.9-V output up to 40-A, steady-state output current
• Convenient test points for probing critical waveforms
3 EVM Electrical Performance Specifications
Table 1. BSR054EVM Electrical Performance Specifications
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Parameter Test Conditions Min Typ Max Units
Input Characteristics
Voltage range VINtied to VDD 5 12 16 V
Maximum input current VIN= 12 V, IO= 40 A, V
= 0.9 V, FSW= 500 kHz 3.5 A
OUT
No load input current VIN= 12 V, IO= 0 A 50 mA
Output Characteristics
V
Output voltage Output current = 0 A to 40 A 0.9 V
OUT
I
Output load current I
OUT
Output voltage regulation
V
Output voltage ripple VIN= 12 V, I
OUT
V
Output overcurrent 46 A
OUT
OUT(min)
to I
OUT(max)
0 40 A
Line regulation: input voltage = 5 V to 16 V 0.5%
Load regulation: output current = 0 A to I
= 40 A 10 mV
OUT
OUT(max)
0.5%
Systems Characteristics
Switching frequency F
V
Peak efficiency VIN= 12 V, IO= 17 A, FSW= 500 kHz 90%
OUT
Operating temperature T
SW
oper
500 kHz
0 85 ºC
PP
4
TPS543C20EVM-054 40-A Single Phase Synchronous Step-Down Converter
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VIN
22uF
C2
22uF
C6
DNP
22uF
C1
22uF
C5
Input: 4.5V to 15V
TP1
TP4
330uF
C4
22uF
C7
22uF
C3
GND
0.1uF
C8
VOUT
100uF
C15
DNP
330uF
C13
330uF
C14
GND
1V@35ADC
100uF
C9
100uF
C16
DNP
100uF
C10
DNP
100uF
C17
100uF
C11
0
R17
0.1uF
C23
1000pF
C24
3.0
R18
470nH
L1
GND
GND
4.7uF
C21
1uF
C20
RSP
1
RSN
2
NC3NC4NC5NC
6
BOOT
7
SW8SW9SW10SW11SW
12
PGND13PGND14PGND15PGND16PGND17PGND18PGND19PGND
20
PVIN21PVIN22PVIN23PVIN24PVIN25VDD
26
GND
27
BP
28
VSEL36ILIM
30
NC31NC
32
EN33PGD
34
SYNC35SS37RT38MODE
39
AGND
29
RAMP
40
PAD
41
U1
TPS543C20RVFT
1.00
R4
TP7
GND
1
2
J3
GND
0
R11
DNP
BP_5V
BP_5V
TP14
TP5
TP6
TP8
0
R6
DNP
0
R1
100k
R16
GND
GND
45.3k
R8
0
R10
DNP
40.2k
R14
8.66k
R15
DNP
0
R3
DNP
22pF
C18
DNP
22pF
C19
DNP
0
R9
DNP
22pF
C22
DNP
0
R5
DNP
GND
TP9
SYNC
TP3
TP10
TP2
TP13
187k
R2
0
R12
0
R13
TP12
TP11
TP15
TP16
TP17
GND
0.1uF
C12
TP18
SYNC
123
4
J1
123
4
J2
51.1k
R7
TP19
TP20
TP21
TP22
BP_5V
TP23
TP24
0.01uF
C25
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4 Schematic
Schematic
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Figure 1. BSR054EVM Schematic
TPS543C20EVM-054 40-A Single Phase Synchronous Step-Down Converter
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Test Equipment
5 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 10 ADC. Also, the output impedance of the external voltage source must be much less
than 100 kΩ.
Multimeters: It is recommended to use two separate multimeters Figure 2. One meter is used to measure
VINand one to measure V
Output Load: A variable electronic load is recommended for testing Figure 2. It must be capable of 40 A
at voltages as low as 0.6 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 3.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.
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. Use the AWG 14 wire (2 wires parallel
for VOUT positive and 2 wires parallel for the VOUT negative) of no more than 1.98 feet between the EVM
and the load. This recommended wire gauge and length should achieve a voltage drop of no more than
0.2 V at the maximum 40-A load.
OUT
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.
6
TPS543C20EVM-054 40-A Single Phase Synchronous Step-Down Converter
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Metal Ground
Barrel
Tip
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6 BSR054EVM
BSR054EVM
Spacer
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Figure 2. BSR054EVM Overview
Figure 3. Tip and Barrel Measurement
TPS543C20EVM-054 40-A Single Phase Synchronous Step-Down Converter
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List of Test Points, Jumpers, and Switch
7 List of Test Points, Jumpers, and Switch
Table 2. Test Point Functions
Item Type Name Description
TP23 T-H loop SW Power supply Switch node
TP11 T-H loop CH-A Measure loop stability
TP12 T-H loop CH-B Measure loop stability
TP3 T-H loop LocS+
TP10 T-H loop LocS-
TP1 T-H loop PVIN Sense VIN + across C8
TP4 T-H loop PGND Sense VIN – across C8
TP6 T-H loop VDD Supplies the internal circuitry
TP9 T-H loop BP LDO output
TP14 T-H loop PG Power good
TP7, TP15, TP16,
TP17
TP19, TP20,
TP21, TP22
TP18 T-H loop SYNC Synchronize with external switching frequency
JP3 2-pin jumper EN Enable or disable TPS543C20EVM-054 IC
T-H loop PGND Common GND
T-H loop Not used
Sense VOUT + locally across C11. Use for efficiency and ripple
measurements
Sense VOUT– locally across C11. Use for efficiency and ripple
measurements
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8 Test Procedure
8.1 Line and Load Regulation Measurement Procedure
1. Connect VOUT to J2 and VOUT_GND to J2 Figure 2.
2. Ensure that the electronic load is set to draw 0 ADC.
3. Ensure the jumper provided on the EVM shorts on J3 before VINis applied
4. Connect VIN to J1 and VIN_GND to J1 Figure 2.
5. Increase VINfrom 0 V to 12 V using the digital multimeter to measure input voltage.
6. Remove the jumper on J3 to enable the controller.
7. Use the other digital multimeter or the oscilloscope to measure output voltage V
Table 3. List of Test Points for Line and Load Measurements
Test Point Node Name Description
TP3 LocS+ Sense VOUT + locally across C11. Use for efficiency and ripple measurements
TP10 LocS- Sense VOUT - locally across C11. Use for efficiency and ripple measurements
TP1 PVIN Sense VIN + across C8
TP4 PGND Sense VIN - across C8
Test Procedure
at TP3 and TP10.
OUT
8. Vary the load from 0 ADCto maximum rated output 40 ADC. V
Table 1.
9. Vary VINfrom 5 V to 16 V. V
10. Decrease the load to 0 A.
11. Put the jumper back on JP3 to disable the converter.
12. Decrease VINto 0 V or turn off the supply.
8.2 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.
Test Point Node Name Description
TP3 LocS+ Sense VOUT + locally across C11. Use for efficiency and ripple measurements
TP10 LocS- Sense VOUT - locally across C11. Use for efficiency and ripple measurements
TP1 PVIN Sense VIN + across C8
TP4 PGND Sense VIN - across C8
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.
must remain in regulation as defined in
OUT
must remain in regulation as defined in Table 1.
OUT
Table 4. List of Test Points for Efficiency Measurements
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Iout (A)
Power Loss (W)
0 5 10 15 20 25 30 35 40
0
1
2
3
4
5
6
7
8
9
10
D003
5 VIN, 0.9 V
OUT
, 500 kHz, 25 qC
9 VIN, 0.9 V
OUT
, 500 kHz, 25 qC
12 VIN, 0.9 V
OUT
, 500 kHz, 25 qC
16 VIN, 0.9 V
OUT
, 500 kHz, 25 qC
Iout (A)
Efficiency (%)
0 5 10 15 20 25 30 35 40
0
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
D002
5 VIN, 0.9 V
OUT
, 500 kHz, 25 qC
9 VIN, 0.9 V
OUT
, 500 kHz, 25 qC
12 VIN, 0.9 V
OUT
, 500 kHz, 25 qC
16 VIN, 0.9 V
OUT
, 500 kHz, 25 qC
Test Procedure
8.3 Equipment Shutdown
1. Reduce the load current to 0 A.
2. Reduce input voltage to 0 V.
3. Shut down the external fan if in use.
4. Shut down equipment.
9 Performance Data and Typical Characteristic Curves
Figure 4 through Figure 13 present typical performance curves for the BSR054EVM.
SPACE
9.1 Efficiency
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9.2 Power Loss
10
TPS543C20EVM-054 40-A Single Phase Synchronous Step-Down Converter
Figure 4. Efficiency of 0.9-V Output vs Load
Figure 5. Power Loss of 0.9-V Output vs Load
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