Texas Instruments TPS543820EVM, User Manual, Page: 1 / 38

User’s Guide
TPS543820EVM SWIFT™ Step-Down Converter Evaluation
Module User's Guide
ABSTRACT
This user’s guide contains information for the TPS543820EVM evaluation module (BSR101) and the
TPS543820 dc/dc converter. Also included are the performance characteristics, schematic, and bill of materials
for the TPS543820EVM.
Table of Contents
1 Introduction ............................................................................................................................................................................. 3
1.1 Background........................................................................................................................................................................ 3
1.2 Before You Begin............................................................................................................................................................... 3
1.3 Performance Characteristics Summary............................................................................................................................. 4
2 Configurations and Modifications ......................................................................................................................................... 6
2.1 Output Voltage................................................................................................................................................................... 6
2.2 Switching Frequency (FSEL Pin)....................................................................................................................................... 7
2.3 Current Limit, Soft-Start Time, and Internal Compensation (MODE Pin)........................................................................... 7
2.4 Adjustable UVLO................................................................................................................................................................ 7
3 Test Setup and Results .......................................................................................................................................................... 8
3.1 Input/Output Connections.................................................................................................................................................. 8
3.2 Efficiency.......................................................................................................................................................................... 11
3.3 Output Voltage Regulation............................................................................................................................................... 13
3.4 Load Transient and Loop Response................................................................................................................................ 14
3.5 Output Voltage Ripple...................................................................................................................................................... 16
3.6 Input Voltage Ripple......................................................................................................................................................... 17
3.7 Synchronizing to a Clock.................................................................................................................................................. 18
3.8 Start-up and Shutdown with EN....................................................................................................................................... 19
3.9 Start-up and Shutdown with VIN...................................................................................................................................... 20
3.10 Start-up Into Pre-Bias..................................................................................................................................................... 21
3.11 Hiccup Current Limit....................................................................................................................................................... 22
3.12 Overvoltage Protection................................................................................................................................................... 24
3.13 Thermal Performance.................................................................................................................................................... 25
4 Board Layout ......................................................................................................................................................................... 26
4.1 Layout.............................................................................................................................................................................. 26
5 Schematic and Bill of Materials ........................................................................................................................................... 27
5.1 Schematic........................................................................................................................................................................ 28
5.2 Bill of Materials................................................................................................................................................................. 30
6 Revision History ................................................................................................................................................................... 32
List of Figures
Figure 3-6. U1 Load Regulation................................................................................................................................................. 13
Figure 3-7. U1 Line Regulation.................................................................................................................................................. 13
Figure 3-8. U2 Load Regulation................................................................................................................................................. 13
Figure 3-9. U2 Line Regulation.................................................................................................................................................. 13
Figure 3-10. U1 Transient Response......................................................................................................................................... 14
Figure 3-11. U2 Transient Response......................................................................................................................................... 14
Figure 3-12. U1 Bode Plot......................................................................................................................................................... 14
Figure 3-13. U2 Bode Plot......................................................................................................................................................... 14
Figure 3-14. U2 Loop Gain with Different Ramp Settings.......................................................................................................... 15
Figure 3-15. U2 Loop Phase with Different Ramp Settings....................................................................................................... 15
Figure 3-16. U1 Output Ripple – No Load................................................................................................................................. 16
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TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's
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