SLVU735A June   2012  – February 2022 TPS51225

 

  1.   Trademarks
  2. 1 Description
    1. 1.1 Typical Applications
    2. 1.2 Features
  3. 2 Electrical Performance Specifications
  4. 3 Schematic
  5. 4 Test Setup
    1. 4.1 Test Equipment
    2. 4.2 Recommended Test Setup
  6. 5 Configurations
  7. 6 Test Procedure
    1. 6.1 Line/Load Regulation and Efficiency Measurement Procedure
    2. 6.2 List of Test Points
    3. 6.3 Equipment Shutdown
  8. 7 Performance Data and Typical Characteristic Curves
    1. 7.1  5-V Efficiency
    2. 7.2  5-V Load Regulation
    3. 7.3  3.3-V Efficiency
    4. 7.4  3.3-V Load Regulation
    5. 7.5  Enable Turn-On/Turn-Off
    6. 7.6  Output Ripple
    7. 7.7  Switching Node
    8. 7.8  5-V Output Transient with Auto-skip Mode
    9. 7.9  3.3-V Output Transient with Auto-skip Mode
    10. 7.10 Output Prebias Turn-On
    11. 7.11 Thermal Image
  9. 8 EVM Assembly Drawing and PCB Layout
  10. 9 Bill of Materials
  11. 10Revision History

6.1 Line/Load Regulation and Efficiency Measurement Procedure

  1. Set up the EVM as described in Section 4 and Figure 4-2.
  2. Ensure Load1 and Load2 are set to constant resistance mode and to sink 0 ADC.
  3. Ensure the configuration settings per Section 5.
  4. Ensure S1 and S2 are in the OFF position before VIN is applied.
  5. Increase VIN from 0 V to 12 V. Use V1 to measure input voltage.
  6. Switch S1 to the ON position to enable the Output1.
  7. Use V2 to measure Vout1 voltage.
  8. Vary Load1 from 0–10 ADC. Vout1 should remain in load regulation.
  9. Vary VIN from 8 V to 20 V. Vout1 should remain in line regulation.
  10. Switch S1 to the OFF position to disable the Output1.
  11. Switch S2 to the ON position to enable the Output2.
  12. Use V3 to measure Vout2 voltage.
  13. Vary Load2 from 0–10 ADC. Vout2 should remain in load regulation.
  14. Vary VIN from 8 V to 20 V. Vout2 should remain in line regulation.
  15. Switch S2 to the OFF position to disable the Output2.
  16. Decrease Load1 and Load2 to 0 A.
  17. Decrease VIN to 0 V.