SLVU346A January   2010  – February 2022 TPS51218

 

  1.   Trademarks
  2. 1Description
    1. 1.1 Typical Applications
    2. 1.2 Features
  3. 2Electrical Performance Specifications
  4. 3Schematic
  5. 4Test Setup
    1. 4.1 Test Equipment
    2. 4.2 Recommended Test Setup
      1. 4.2.1 Configurations
      2. 4.2.2 Input Connections
      3. 4.2.3 Output Connections
      4. 4.2.4 Other Connections
  6. 5Test Procedure
    1. 5.1 Line/Load Regulation and Efficiency Measurement Procedure
    2. 5.2 List of Test Points
    3. 5.3 Equipment Shutdown
  7. 6Performance Data and Typical Characteristic Curves
    1. 6.1 Efficiency
    2. 6.2 Load Regulation
    3. 6.3 Transient Response
    4. 6.4 Output Ripple
    5. 6.5 Switch Node Voltage
    6. 6.6 Turn-On Waveform
    7. 6.7 Turn-Off Waveform
    8. 6.8 Output 1.1-V Prebias Turn-On
  8. 7EVM Assembly Drawing and PCB Layout
  9. 8Bill of Materials
  10. 9Revision History

5.1 Line/Load Regulation and Efficiency Measurement Procedure

  1. Ensure that the load is set to constant resistance mode and to sink 0 ADC.
  2. Ensure that the jumper provided in the EVM to short J4 is on before VIN is applied.
  3. Ensure that the jumper provided in the EVM to short pin 2 and pin 3 of J3 is on before VIN is applied.
  4. Increase VIN from 0 V to 12 V. Use V1 to measure the input voltage.
  5. Remove the jumper on J4 to enable the controller.
  6. Vary the load from 0 ADC to 20 ADC. VOUT must remain in load regulation.
  7. Vary VIN from 8 V to 14 V. VOUT must remain in line regulation.
  8. Put the jumper on J4 to disable the controller.
  9. Decrease the load to 0 A.
  10. Decrease VIN to 0 V.