Texas Instruments TPS51220A EVM-476, User Manual

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User’s Guide
TPS51220A Buck Controller Evaluation Module User's
Guide
Table of Contents
1 Introduction ............................................................................................................................................................................. 3
2 Description .............................................................................................................................................................................. 3
2.1 Typical Applications............................................................................................................................................................ 3
2.2 Features............................................................................................................................................................................. 3
3 Electrical Performance Specifications ................................................................................................................................. 3
4 Schematic ................................................................................................................................................................................ 5
5 Test Setup ................................................................................................................................................................................ 6
5.1 Test Equipment.................................................................................................................................................................. 6
5.2 Recommended Test Setup................................................................................................................................................. 6
5.3 List of Test Points............................................................................................................................................................... 7
6 Test Procedure ........................................................................................................................................................................ 8
6.1 Line/Load Regulation and Efficiency Measurement Procedure......................................................................................... 8
6.2 Output Ripple Test.............................................................................................................................................................. 9
6.3 Measuring Improved Light Load Efficiency........................................................................................................................ 9
6.4 Control Architecture and OVP Select............................................................................................................................... 10
6.5 Overcurrent Trip Level and Output Discharge Select....................................................................................................... 10
7 Performance Data and Typical Characteristic Curves ....................................................................................................... 11
7.1 Efficiency.......................................................................................................................................................................... 11
7.2 Load Regulation............................................................................................................................................................... 11
7.3 Bode Plot.......................................................................................................................................................................... 12
7.4 Transient Response......................................................................................................................................................... 12
7.5 Output Ripple and Switch Node....................................................................................................................................... 13
7.6 Turn-On Waveform........................................................................................................................................................... 13
7.7 Turn-Off Waveform........................................................................................................................................................... 14
8 EVM Assembly Drawing and PCB Layout .......................................................................................................................... 15
9 List of Materials ..................................................................................................................................................................... 21
10 Revision History ................................................................................................................................................................. 21
List of Figures
Figure 4-1. TPS51220A EVM-476 Schematic............................................................................................................................. 5
Figure 5-1. TPS51220A EVM-476 Recommended Test Setup.................................................................................................... 6
Figure 5-2. Recommended Tip and Barrel Technique to Measure Output Ripple Voltage.......................................................... 6
Figure 7-1. Efficiency, 12 V
IN
, 5.0-V Output............................................................................................................................... 11
Figure 7-2. Efficiency, 12 V
IN
, 3.3-V Output............................................................................................................................... 11
Figure 7-3. 12 V
IN
, 5.0-V Load Regulation................................................................................................................................. 11
Figure 7-4. 12 V
IN
, 3.3-V Load Regulation................................................................................................................................. 11
Figure 7-5. CCM mode 5-V Loop Response Gain and Phase, f
CO
= 95 kHz, PM = 48°........................................................... 12
Figure 7-6. CCM mode 3.3-V Loop Response Gain and Phase, f
CO
= 90 kHz, PM = 63°........................................................ 12
Figure 7-7. 5-V CCM Mode Load Transient............................................................................................................................... 12
Figure 7-8. 5-V D-CAP Mode Load Transient............................................................................................................................ 12
Figure 7-9. 5-V CCM Mode Output Ripple and Switch Node.................................................................................................... 13
Figure 7-10. 3.3-V CCM Mode Output Ripple............................................................................................................................ 13
Figure 7-11. Enable Turn-On Waveform.................................................................................................................................... 13
Figure 7-12. Enable Turn-Off With Discharge Waveform.......................................................................................................... 14
Figure 7-13. Enable Turn-Off Without Discharge Waveform..................................................................................................... 14
Figure 8-1. Top Layer Assembly Drawing (Top View)................................................................................................................ 15
Figure 8-2. Bottom Assembly Drawing (Top View).................................................................................................................... 16
Figure 8-3. Top Copper (Top View)............................................................................................................................................ 17
Figure 8-4. Internal Layer 1 (Top View)...................................................................................................................................... 18
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SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022
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