Texas Instruments TPS546B24AEVM-2PH, User Manual, Page: 1 / 47

User’s Guide
TPS546B24A 2-Phase SWIFT™ Step-Down Converter
Evaluation Module User's Guide
ABSTRACT
The TPS546B24AEVM-2PH evaluation module (EVM) is a two-phase buck converter with two TPS546B24A
devices. The TPS546B24A device is a stackable synchronous buck with PMBus interface that can operate from
a nominal 2.95-V to 18-V supply. The device allows programming and monitoring through the interface.
Two TPS546B24A devices are configured as two-phase buck converter in factory default. Output current is
evenly distributed in the two devices; both the negative and positive output terminals are connected together.
Table of Contents
1 Description .............................................................................................................................................................................. 4
1.1 Before You Begin............................................................................................................................................................... 4
1.2 Typical Applications............................................................................................................................................................ 4
1.3 Features............................................................................................................................................................................. 5
2 Electrical Performance Specifications ................................................................................................................................. 5
3 Schematic ................................................................................................................................................................................ 6
4 Test Setup ................................................................................................................................................................................ 9
4.1 Test and Configuration Software........................................................................................................................................ 9
4.2 Test Equipment.................................................................................................................................................................. 9
4.3 Tip and Barrel Measurement............................................................................................................................................ 10
4.4 List of Test Points, Jumpers, and Connectors.................................................................................................................. 10
4.5 Evaluating Single Phase Operation................................................................................................................................. 13
4.6 Evaluating Split Rail Input................................................................................................................................................ 13
4.7 Configuring EVM to Overdrive VDD5............................................................................................................................... 13
5 EVM Configuration Using the Fusion GUI .......................................................................................................................... 14
5.1 Configuration Procedure.................................................................................................................................................. 14
6 Test Procedure ...................................................................................................................................................................... 14
6.1 Line and Load Regulation and Efficiency Measurement Procedure................................................................................ 14
6.2 Efficiency Measurement Test Points................................................................................................................................ 15
6.3 Control Loop Gain and Phase Measurement Procedure................................................................................................. 16
7 Performance Data and Typical Characteristic Curves ...................................................................................................... 17
7.1 Efficiency.......................................................................................................................................................................... 17
7.2 Load and Line Regulation (Measured Between TP22 and TP25).................................................................................... 17
7.3 Transient Response......................................................................................................................................................... 18
7.4 Control Loop Bode Plot.................................................................................................................................................... 18
7.5 Output Ripple................................................................................................................................................................... 19
7.6 Power MOSFET Drain-Source Voltage............................................................................................................................ 20
7.7 Control On........................................................................................................................................................................ 21
7.8 Control Off........................................................................................................................................................................ 22
7.9 Control On with Pre-Biased Output.................................................................................................................................. 23
7.10 Current Sharing Between Two Phases.......................................................................................................................... 23
7.11 Thermal Image............................................................................................................................................................... 24
8 EVM Assembly Drawing and PCB Layout .......................................................................................................................... 25
9 Bill of Materials ..................................................................................................................................................................... 28
10 Using the Fusion GUI ......................................................................................................................................................... 31
10.1 Opening the Fusion GUI................................................................................................................................................ 31
10.2 General Settings............................................................................................................................................................ 32
10.3 Changing ON_OFF_CONFIG........................................................................................................................................ 33
10.4 Pop-up for Some Commands While Conversion is Enabled.......................................................................................... 34
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SLUUC48A – FEBRUARY 2020 – REVISED FEBRUARY 2022
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TPS546B24A 2-Phase SWIFT™ Step-Down Converter Evaluation Module
User's Guide
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