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Table of Contents
User’s Guide
TPS5403 Step-Down Converter Evaluation Module User's
Guide
Table of Contents
1 Introduction.............................................................................................................................................................................2
2 Background.............................................................................................................................................................................2
3 Board Layout...........................................................................................................................................................................2
4 Bench Test Setup Conditions................................................................................................................................................ 4
4.1 Headers Description and Jumper Placement.....................................................................................................................4
4.2 Jumpers and Switches....................................................................................................................................................... 4
5 Power-Up Procedure.............................................................................................................................................................. 4
6 Schematic and Bill of Materials.............................................................................................................................................5
7 Revision History......................................................................................................................................................................6
List of Figures
Figure 3-1. Placement (Top Layer).............................................................................................................................................. 2
Figure 3-2. Board Layout (Top Layer)..........................................................................................................................................3
Figure 3-3. Board Layout (Bottom Layer).................................................................................................................................... 3
Figure 4-1. Headers Description and Jumper Placement............................................................................................................4
Figure 6-1. TPS5403EVM Schematic..........................................................................................................................................5
List of Tables
Table 2-1. Summary of Performance........................................................................................................................................... 2
Table 4-1. Jumpers and Switches................................................................................................................................................4
Table 6-1. TPS5403EVM Bill of Materials....................................................................................................................................6
Trademarks
All trademarks are the property of their respective owners.
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1
Introduction
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1 Introduction
This document presents the information required to operate the TPS5403 as well as the support documentation
including the schematic and bill of materials.
2 Background
The TPS5403 is designed to provide 1.7-A continuous current with an operational range of 4.5 V to 28 V and an
external set switching frequency ranging from 50 kHz to 1.1 MHz.
As there are many possible options to set the converters, Table 2-1 presents the performance specification
summary for the EVM.
Table 2-1. Summary of Performance
TEST CONDITIONS
PERFORMANCE
VIN = 4.5 V to 28 V
fSW = 300 kHz
(25°C ambient)
Buck: 3.3 V, up to 1.7 A
The evaluation module is designed to provide access to the features of the TPS5403. Some modifications
can be made to this module to test performance at different input and output voltages, current and switching
frequency. Please contact TI Field Applications Group for advice on these matters.
3 Board Layout
Figure 3-1. Placement (Top Layer)
2
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Board Layout
Figure 3-2. Board Layout (Top Layer)
Figure 3-3. Board Layout (Bottom Layer)
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3
Bench Test Setup Conditions
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4 Bench Test Setup Conditions
4.1 Headers Description and Jumper Placement
Figure 4-1. Headers Description and Jumper Placement
Test points:
1. LX, VIN, VOUT
4.2 Jumpers and Switches
Table 4-1. Jumpers and Switches
NO.
JP4
FUNCTION
Switching Frequency
PLACEMENT
Connect JP4 to GND and set the switching frequency to
50 kHz; Leave it open and set switching frequency to 120 kHz;
Connect a resistor to set the switching frequency
COMMENT
See the TPS5405 Monolithic NonSynchronous Step-Down Regulator With
Integrated MOSFET Data Sheet for the
resistor value corresponding to specific
switching frequency.
5 Power-Up Procedure
1. Apply 4.5 V – 28 V to JP1.
2. Apply load to the output connector.
4
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Schematic and Bill of Materials
6 Schematic and Bill of Materials
The following pages contain the TPS5403EVM schematic and bill of materials.
Figure 6-1. TPS5403EVM Schematic
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Revision History
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Table 6-1. TPS5403EVM Bill of Materials
ITEM NO.
QTY
DESIGNATOR
VALUE
MANUFACTURER
1
1
C1
0.1 μF
Generic
Capacitor, 0.1 μF, 35 V, Ceramic, X7R,
0603
2
3
C2, C8B, C8C
10 μF
Generic
Capacitor, 10 μF, 35 V, Ceramic, X5R,
0805
3
2
C2A, C8A
220 μF
Rubycon
4
1
C4
10 nF
Generic
Capacitor, 10 nF, 35 V, Ceramic, X7R,
0603
C5
470 pF
Generic
Capacitor, 470 pF, 50 V, Ceramic, X7R,
0603
5
PART NO.
5YXF220MEFC
DESCRIPTION
220 μF/35V 10x12.5
6
1
C6A
2.2 nF
Generic
Capacitor, 2.2 nF, 50 V, Ceramic, X7R,
0603
7
DNI
C6B
100 pF
Generic
Capacitor, 100 pF, 50 V, Ceramic, X7R,
0603
8
1
D1
Comchip
SB240E
Comchip SB240E 2-A/40-V Schottky
Rectifier
9
1
JP4
Mill-Max
Manufacturing Corp.
800-10-064-10-001000
Three Pin Jumper, SIP HEADER 64
POS STRAIGHT PCB
10
1
L1
82 μH
Bourns
RL622-820K-RC
Magnetic-Core Inductor
11
3
R1, R8, R5b1
0
Generic
Resistor, 1%, 1/10W, 0603, SMD
12
1
R3
100 K
Generic
Resistor, 1%, 1/10W, 0603, SMD
13
1
R6
47 K
Generic
Resistor, 1%, 1/10W, 0603, SMD
14
DNI
R5b2
3.8 k
Generic
Resistor, 1%, 1/10W, 0603, SMD
15
2
TP1, TP2
5001
Generic
5001
Keystone Electronics, Test Point, Black
16
3
TP5, TP6, TP7
5002
Generic
5002
Keystone Electronics, Test Point, White
17
1
U1
Texas Instruments
TPS5403
SOIC8
18(1)
1
Sullins Connector
Solutions
SPC02SYAN
SPC02SYAN, CONN JUMPER
SHORTING GOLD FLASH
(1)
Install item 18 on item 8 to the inner side.
7 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision * (September 2012) to Revision A (November 2021)
Page
• Updated the numbering format for tables, figures, and cross-references throughout the document. ................2
• Updated the user's guide title............................................................................................................................. 2
6
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