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Table of Contents
User’s Guide
TPS54531 Step-Down Converter Evaluation Module User's
Guide
ABSTRACT
This user's guide contains information for the TPS54531EVM-530 evaluation module as well as for
the TPS54531. Included are the performance specifications, schematic, and the bill of materials of the
TPS54531EVM-530.
Table of Contents
1 Introduction.............................................................................................................................................................................3
2 Performance Specification Summary................................................................................................................................... 3
3 Modifications...........................................................................................................................................................................4
3.1 Output Voltage Setpoint..................................................................................................................................................... 4
3.2 Output Filter and Closed-Loop Response..........................................................................................................................4
4 Test Setup and Results.......................................................................................................................................................... 4
4.1 Input/Output Connections.................................................................................................................................................. 4
4.2 Efficiency............................................................................................................................................................................5
4.3 Load Regulation................................................................................................................................................................. 6
4.4 Line Regulation.................................................................................................................................................................. 6
4.5 Loop Response.................................................................................................................................................................. 7
4.6 Load Transient Response.................................................................................................................................................. 7
4.7 Output Voltage Ripple........................................................................................................................................................ 8
4.8 Input Voltage Ripple........................................................................................................................................................... 9
4.9 Start-Up............................................................................................................................................................................10
4.10 Shutdown........................................................................................................................................................................11
5 Board Layout.........................................................................................................................................................................12
5.1 Layout.............................................................................................................................................................................. 12
6 Schematic, Bill of Materials, and Reference...................................................................................................................... 15
6.1 Schematic........................................................................................................................................................................ 15
6.2 Bill of Materials.................................................................................................................................................................16
6.3 Reference.........................................................................................................................................................................16
List of Figures
Figure 4-1. TPS54531EVM-530 Efficiency.................................................................................................................................. 5
Figure 4-2. TPS54531EVM-530 Light-Load Efficiency................................................................................................................ 5
Figure 4-3. TPS54531EVM-530 Load Regulation, VIN = 12 V and VIN = 24 V............................................................................ 6
Figure 4-4. TPS54531EVM-530 Line Regulation........................................................................................................................ 6
Figure 4-5. TPS54531EVM-530 Closed Loop Response............................................................................................................ 7
Figure 4-6. TPS54531EVM-530 Load Transient Response........................................................................................................ 7
Figure 4-7. TPS54531EVM-530 Output Voltage Ripple (IOUT = 5 A)...........................................................................................8
Figure 4-8. TPS54531EVM-530 Output Voltage Ripple (IOUT = 1 A)...........................................................................................8
Figure 4-9. TPS54531EVM-530 Output Voltage Ripple (IOUT = 0 A)...........................................................................................9
Figure 4-10. TPS54531EVM-530 Input Voltage Ripple............................................................................................................... 9
Figure 4-11. TPS54531EVM-530 Start-Up Relative to VIN with SS........................................................................................... 10
Figure 4-12. TPS54531EVM-530 Start-Up Relative to EN with SS...........................................................................................10
Figure 4-13. TPS54531EVM-530 Shutdown Relative to VIN with SS........................................................................................ 11
Figure 4-14. TPS54531EVM-530 Shutdown Relative to EN with SS.........................................................................................11
Figure 5-1. Top Assembly.......................................................................................................................................................... 12
Figure 5-2. Top Layer.................................................................................................................................................................13
Figure 5-3. Internal Layer 1....................................................................................................................................................... 13
Figure 5-4. Internal Layer 2....................................................................................................................................................... 14
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Trademarks
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Figure 5-5. Bottom Layer........................................................................................................................................................... 14
Figure 6-1. TPS54531EVM-530 Schematic Diagram................................................................................................................ 15
List of Tables
Table 1-1. Input Voltage and Output Current Summary...............................................................................................................3
Table 2-1. TPS54531EVM-530 Performance Specifications Summary.......................................................................................3
Table 4-1. Connection and Test Points........................................................................................................................................ 4
Table 6-1. Bill of Materials..........................................................................................................................................................16
Trademarks
Eco Mode™ is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
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Introduction
1 Introduction
The TPS54531 DC/DC converter is designed to provide up to a 5-A output from an input voltage source of 3.5 V
to 28 V. Rated input voltage and output current range for the evaluation module are given in Table 1-1.
The TPS54531EVM-530 evaluation module circuit is a single, non-synchronous buck converter providing 5
V at 5 A from an 8-V to 28-V input. The switching frequency is internally set at a nominal 570 kHz. The
high-side MOSFET is incorporated inside the TPS54531 package along with the gate-drive circuitry. The low
drain-to-source on resistance of the MOSFET allows the TPS54531 to achieve high efficiencies and helps
keep the junction temperature low at high output currents. The compensation components are external to the
integrated circuit (IC), and an external divider allows for an adjustable output voltage. Additionally, the TPS54531
provides adjustable slow start and undervoltage lockout inputs. The absolute maximum input voltage is 30 V for
the TPS54531EVM-530. This user’s guide describes the TPS54531EVM-530 performance.
Table 1-1. Input Voltage and Output Current Summary
EVM
INPUT VOLTAGE RANGE
OUTPUT CURRENT RANGE
TPS54531EVM-530
VIN = 8 V to 28 V
0 A to 5 A
2 Performance Specification Summary
A summary of the TPS54531EVM-530 performance specifications is provided in Table 2-1. Specifications are
given for an input voltage of VIN = 12 V and an output voltage of 1.05 V, unless otherwise noted. The ambient
temperature is 25°C for all measurement, unless otherwise noted.
Table 2-1. TPS54531EVM-530 Performance Specifications Summary
SPECIFICATIONS
TEST CONDITIONS
Input voltage range (VIN)
MIN
TYP
MAX
8
12
28
Output voltage
5
Operating frequency
0
Line regulation
IO = 2.5 A
Load regulation
VIN = 12 V
Overcurrent limit
VIN = 12 V,
Output ripple voltage
Maximum efficiency
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V
V
570
Output current range
UNIT
kHz
5
A
±0.06
%
±0.1
%
8.5
A
VIN = 12 V, IO = 5 A
15
mVPP
VIN = 8 V, IO= 0.7 A
95.3
5.5
%
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Modifications
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3 Modifications
These evaluation modules are designed to provide access to the features of the TPS54531. Some modifications
can be made to this module.
3.1 Output Voltage Setpoint
To change the output voltage of the EVMs, it is necessary to change the value of resistor R6. The value of R6 for
a specific output voltage above 0.8 V can be calculated using Equation 1.
R6 =
R5×0.8V
VOUT -0.8V
(1)
3.2 Output Filter and Closed-Loop Response
The TPS54531 relies on the output filter characteristics and the compensation network of R3, C6, and C7 to
ensure stability of the control loop. Pads for a feed forward capacitor (C11) are also included for increased
flexibility.
4 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54531EVM-530. The section also
includes test results typical for the evaluation modules and efficiency, output load regulation, output line
regulation, load transient response, output voltage ripple, input voltage ripple, start-up, and switching frequency.
4.1 Input/Output Connections
The TPS54531EVM-530 is provided with input and output connectors and test points as shown in Table 4-1.
A power supply capable of supplying 4 A must be connected to J1 through a pair of 20-AWG wires. The load
must be connected to J2 through a pair of 20-AWG wires. The maximum load current capability is 5 A. Wire
lengths must be minimized to reduce losses in the wires. Test point TP1 provides a place to monitor the VIN input
voltages with TP2 providing a convenient ground reference. TP7 is used to monitor the output voltage with TP8
as the ground reference.
Table 4-1. Connection and Test Points
REFERENCE DESIGNATOR
4
FUNCTION
J1
VIN (see Table 1-1 for VIN range)
J2
VOUT, 5 V at 5-A maximum
JP1
EN control. Jumper JP1-1 (EN) to JP1-2 (GND) to disable, remove jumper to enable
TP1
VIN test point at VIN connector
TP2
GND test point at VIN connector
TP3
EN test point
TP4
SS test point
TP5
Switch node test point
TP6
Loop response measurement test point
TP7
Output voltage test point at VOUT connector
TP8
Ground test point at VOUT connector
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Test Setup and Results
4.2 Efficiency
Figure 4-1 shows the efficiency for the TPS54531EVM-530 at an ambient temperature of 25°C.
100
90
80
VIN = 12 V
Efficiency - %
70
VIN = 24 V
60
50
40
30
20
10
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Output Current - A
C001
Figure 4-1. TPS54531EVM-530 Efficiency
Figure 4-2 shows the efficiency at light loads for the TPS54531EVM-530 at an ambient temperature of 25°C.
100
90
VIN = 12 V
80
Efficiency - %
70
60
50
VIN = 24 V
40
30
20
10
0
0.001
0.01
0.1
1
10
Output Current - A
C002
Figure 4-2. TPS54531EVM-530 Light-Load Efficiency
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Test Setup and Results
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4.3 Load Regulation
The load regulation for the TPS54531EVM-530 is shown in Figure 4-3.
0.20
0.15
Load Regulation - %
0.10
VIN = 12 V
0.05
0.00
±0.05
VIN = 24 V
±0.10
±0.15
±0.20
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Output Current - A
C003
Figure 4-3. TPS54531EVM-530 Load Regulation, VIN = 12 V and VIN = 24 V
4.4 Line Regulation
The line regulation for the TPS54531EVM-530 is shown in Figure 4-4.
0.5
0.4
0.3
Line Rgulation - %
0.2
IOUT = 2.5 A
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
5
10
15
20
25
30
Input Voltage - V
C004
Figure 4-4. TPS54531EVM-530 Line Regulation
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Test Setup and Results
4.5 Loop Response
The TPS54531EVM-530 closed loop response is shown in Figure 4-5. Input voltage is 12 V and output current is
2.5 A.
60
180
40
120
20
60
0
0
Gain
-20
Phase - Degrees
Gain - dB
Phase
-60
-40
-120
-60
10
100
1000
10000
100000
-180
1000000
Frequency - Hz
C005
Figure 4-5. TPS54531EVM-530 Closed Loop Response
4.6 Load Transient Response
The TPS54531EVM-530 response to load transient is shown in Figure 4-6. The current step is from 1.25 A to
3.75 A. Total peak-to-peak voltage variation is as shown.
VOUT = 200 mV / div (ac coupled)
IOUT = 1 A / div
Load step = 1.25 - 3.75 A, slew rate = 500 mA / µsec
Time = 200 µsec / div
Figure 4-6. TPS54531EVM-530 Load Transient Response
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Test Setup and Results
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4.7 Output Voltage Ripple
The TPS54531EVM-530 output voltage ripple is shown in Figure 4-7. The output current is the rated full load of 5
A.
VOUT = 20 mV / div (ac coupled)
SW = 5 V / div
Time = 1 µsec / div
Figure 4-7. TPS54531EVM-530 Output Voltage Ripple (IOUT = 5 A)
The TPS54531EVM-530 output voltage ripple is shown in Figure 4-8. The output current is 1 A.
VOUT = 20 mV / div (ac coupled)
SW = 5 V / div
Time = 1 µsec / div
Figure 4-8. TPS54531EVM-530 Output Voltage Ripple (IOUT = 1 A)
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Test Setup and Results
The TPS54531EVM-530 output voltage ripple is shown in Figure 4-9. The output current is 0 A (no load).
VOUT = 20 mV / div (ac coupled)
SW = 5 V / div
Time = 500 µsec / div
Figure 4-9. TPS54531EVM-530 Output Voltage Ripple (IOUT = 0 A)
4.8 Input Voltage Ripple
The TPS54531EVM-530 input voltage ripple is shown in Figure 4-10. The output current is the rated full load of 5
A.
VIN = 200 mV / div (ac coupled)
SW = 5 V / div
Time = 1 µsec / div
Figure 4-10. TPS54531EVM-530 Input Voltage Ripple
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4.9 Start-Up
The TPS54531EVM-530 start-up waveforms relative to VIN and EN are shown in Figure 4-11 and Figure 4-12.
RLOAD = 5 Ω
VIN = 10 V / div
EN = 2 V / div
SS = 2 V / div
VOUT = 2 V / div
Time = 2 msec / div
Figure 4-11. TPS54531EVM-530 Start-Up Relative to VIN with SS
VIN = 10 V / div
EN = 2 V / div
SS = 2 V / div
VOUT = 2 V / div
Time = 2 msec / div
Figure 4-12. TPS54531EVM-530 Start-Up Relative to EN with SS
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Test Setup and Results
4.10 Shutdown
The TPS54531EVM-530 shutdown waveforms relative to VIN and EN are shown in Figure 4-13 and Figure 4-14.
RLOAD = 5 Ω
VIN = 10 V / div
EN = 2 V / div
SS = 2 V / div
VOUT = 2 V / div
Time = 5 msec / div
Figure 4-13. TPS54531EVM-530 Shutdown Relative to VIN with SS
VIN = 10 V / div
EN = 2 V / div
SS = 2 V / div
VOUT = 2 V / div
Time = 5 msec / div
Figure 4-14. TPS54531EVM-530 Shutdown Relative to EN with SS
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Board Layout
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5 Board Layout
This section provides description of the TPS54531EVM-530, board layout, and layer illustrations.
5.1 Layout
The board layout for the TPS54531EVM-530 is shown in Figure 5-1 through Figure 5-5. The top layer contains
the main power traces for VIN, VOUT, and ground. Also on the top layer are connections for the pins of the
TPS54531. Most of the signal traces also are located on the top side. The input decoupling capacitors (C1, C2,
and C3) are located as close to the IC as possible. The input and output connectors, test points, and all of the
components are located on the top side. An analog ground area is provided on the top side to terminate the
sensitive compensation components (C7 and R3) and the output voltage feed back divider (R6). This ground
area and the main power ground (GND) are connected at a single point on the top layer at the IC pin 7 (GND).
The two internal layers are completely dedicated to power ground planes for heat dissipation. The bottom layer
is primarily power ground with traces to connect the BOOT capacitor (C4) and the feedback trace from VOUT to
the voltage set point divider network.
Figure 5-1. Top Assembly
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Board Layout
Figure 5-2. Top Layer
Figure 5-3. Internal Layer 1
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Figure 5-4. Internal Layer 2
Figure 5-5. Bottom Layer
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Schematic, Bill of Materials, and Reference
6 Schematic, Bill of Materials, and Reference
6.1 Schematic
Figure 6-1 is the schematic for the TPS54531EVM-530.
TP5
TP7
L1
J2
4.7 uH
TP8
C4
2
VOUT 5V, 5A
1
GND
0.1µF
U1
TPS54531
1
TP1
J1
VIN 8-28VOLTS
1
GND
2
2
TP2
R1
C1
C2
C3
4.7µF
4.7µF
0.01µF
TP3
3
665k
TP4
4
BOOT
PH
VIN
GND
EN
COMP
SS
VSNS
8
D1
CDBC540-G
0.55V
1
R2
130k
C5
0.01µF
C9
C10
47µF
open
R4
51.1
7
TP6
6
5
C6
R5
C11
2200pF
10.2K
open
C7
9 PWR PAD
JP1
SH-J1
C8
47µF
R3
22pF
37.4k
2
R6
1.96k
Figure 6-1. TPS54531EVM-530 Schematic Diagram
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Schematic, Bill of Materials, and Reference
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6.2 Bill of Materials
Table 6-1. Bill of Materials
DESIGNATOR
QTY
VALUE
1
DESCRIPTION
PACKAGE REFERENCE
Printed Circuit Board
PART NUMBER
MANUFACTURER
PWR530A
Any
C1, C2
2
4.7 μF
CAP, CERM, 4.7 μF, 50 V, ±10%, X7R, 1210
1210
GRM32ER71H475KA88L
MuRata
C3
1
0.01 μF
CAP, CERM, 0.01 μF, 50 V, ±10%, X7R, 0805
0805
GRM216R71H103KA01D
MuRata
C4
1
0.1 μF
CAP, CERM, 0.1 μF, 25 V, ±10%, X7R, 0603
0603
C1608X7R1E104K
TDK
C5
1
0.01 μF
CAP, CERM, 0.01 μF, 100 V, ±10%, X7R, 0603
0603
06031C103KAT2A
AVX
C6
1
2200 pF
CAP, CERM, 2200 pF, 50 V, +10/%, X7R, 0603
0603
GRM188R71H222KA01D
MuRata
C7
1
22 pF
CAP, CERM, 22 pF, 50 V, +5/%, C0G/NP0,
0603
0603
GRM1885C1H220JA01D
MuRata
C8, C9
2
47 μF
CAP, CERM, 47 μF, 10 V, ±10%, X5R, 1210
1210
GRM32ER61A476KE20L
MuRata
C10
0
CAP, CERM,
1210
C11
0
CAP, CERM,
0603
D1
1
0.55 V
Diode, Schottky, 4 0V, 5 A, SMC
SMC
CDBC540-G
Comchip Technology
J1, J2
2
ED555/2DS
Connector, Male 2 Pole 3.5 mm, 6 A, 150 V
6.5 × 6.5 mm
ED555/2DS
On Shore Tech
JP1
1
PEC02SAAN
Header, Male 2-pin, 100-mil spacing,
0.100 inch × 2
PEC02SAAN
Sullins
L1
1
4.7 μH
Inductor, 7 A, 15 mΩ
10mm × 10 mm
74437368047
Wurth Electronik
LBL1
1
Thermal Transfer Printable Labels, 1.250" W ×
0.250" H - 10,000 per roll
PCB Label 1.25"H × 0.250"W
THT-13-457-10
Brady
R1
1
665 k
RES, 6650k Ω, 1%, 0.1W, 0603
0603
CRCW0603665KFKEA
Vishay-Dale
R2
1
130 k
RES, 130k Ω, 1%, 0.1 W, 0603
0603
CRCW060130KFKEA
Vishay-Dale
R3
1
37.4 k
RES, 37.4k Ω, 1%, 0.1 W, 0603
0603
CRCW060337K4FKEA
Vishay-Dale
R4
1
51.1
RES, 51.1 Ω, 1%, 0.1 W, 0603
0603
CRCW060351R1FKEA
Vishay-Dale
R5
1
10.2 K
RES, 10.2 Ω, 1%, 0.1 W, 0603
0603
CRCW060310R2FKEA
Vishay-Dale
R6
1
1.96 k
RES, 1.96 k Ω, 1%, 0.1 W, 0603
0603
CRCW06031K96FKEA
Vishay-Dale
SH-J1
1
1×2
Shunt, 100 mil, Gold plated, Black
Shunt
969102-0000-DA
3M
TP1, TP5, TP7 3
Red
Test Point, TH, Compact, Red
Keystone5005
5005
Keystone
TP2, TP8
2
Black
Test Point, TH, Compact, Black
Keystone5006
5006
Keystone
TP3, TP4, TP6 3
White
Test Point, TH, Compact, White
Keystone5007
5007
Keystone
IC, DC-DC Converter, 4.5 – 28 VIN, 5 A
DDA-8
TPS54531DDA
Texas Instruments
U1
1
6.3 Reference
TPS54531, 5A, 28-V Input, Step-Down SWIFT™ Converter with Eco Mode™ Data Sheet
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