Texas Instruments TPS54331, User Manual

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User’s Guide
TPS54331 Step-Down Converter Evaluation Module User's
Guide
Table of Contents
1 Introduction ............................................................................................................................................................................. 2
1.1 Background........................................................................................................................................................................ 2
1.2 Performance Specification Summary................................................................................................................................. 2
1.3 Modifications...................................................................................................................................................................... 3
2 Test Setup and Results .......................................................................................................................................................... 4
2.1 Input / Output Connections................................................................................................................................................ 4
2.2 Efficiency............................................................................................................................................................................ 4
2.3 Output Voltage Load Regulation........................................................................................................................................ 5
2.4 Output Voltage Line Regulation......................................................................................................................................... 6
2.5 Load Transients.................................................................................................................................................................. 6
2.6 Loop Characteristics.......................................................................................................................................................... 7
2.7 Output Voltage Ripple........................................................................................................................................................ 7
2.8 Input Voltage Ripple........................................................................................................................................................... 8
2.9 Powering Up....................................................................................................................................................................... 8
3 Board Layout ......................................................................................................................................................................... 10
3.1 Layout.............................................................................................................................................................................. 10
4 Schematic and Bill of Materials ........................................................................................................................................... 12
4.1 Schematic........................................................................................................................................................................ 12
4.2 Bill of Materials................................................................................................................................................................. 13
5 Revision History ................................................................................................................................................................... 13
List of Figures
Figure 2-1. TPS54331 Efficiency................................................................................................................................................. 4
Figure 2-2. TPS54331 Low Current Efficiency............................................................................................................................. 5
Figure 2-3. TPS54331 Load Regulation...................................................................................................................................... 5
Figure 2-4. TPS54331 Line Regulation....................................................................................................................................... 6
Figure 2-5. TPS54331 Transient Response................................................................................................................................ 6
Figure 2-6. TPS54331 Loop Response....................................................................................................................................... 7
Figure 2-7. TPS54331 Output Ripple.......................................................................................................................................... 7
Figure 2-8. TPS54331 Input Ripple............................................................................................................................................. 8
Figure 2-9. TPS54331 Start-Up Relative to Vin........................................................................................................................... 8
Figure 2-10. TPS5331 Start-up Relative to Enable..................................................................................................................... 9
Figure 3-1. Top-Side Layout...................................................................................................................................................... 10
Figure 3-2. Bottom-Side Layout (Looking From Top Side)......................................................................................................... 11
Figure 3-3. Top-Side Assembly.................................................................................................................................................. 11
Figure 4-1. TPS54331EVM-232 Schematic............................................................................................................................... 12
List of Tables
Table 1-1. Input Voltage and Output Current Summary............................................................................................................... 2
Table 1-2. TPS54331EVM-232 and Performance Specification Summary.................................................................................. 2
Table 1-3. Output Voltages Available........................................................................................................................................... 3
Table 2-1. EVM Connectors and Test Points............................................................................................................................... 4
Table 4-1. TPS54331EVM-232 Bill of Materials......................................................................................................................... 13
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www.ti.com Table of Contents
SLVU247A – JULY 2008 – REVISED OCTOBER 2021
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