SLUU420A May   2010  – February 2022 TPS51217

 

  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
      1. 4.1.1 Voltage Source
      2. 4.1.2 Multimeters
      3. 4.1.3 Pulse Generator
      4. 4.1.4 Output Load
      5. 4.1.5 Oscilloscope
      6. 4.1.6 Fan
      7. 4.1.7 Recommended Wire Gauge
    2. 4.2 Recommended Test Setup
      1. 4.2.1 Input Connections
      2. 4.2.2 Output Connections
      3. 4.2.3 Other Connections
    3. 4.3 List of Test Points
  6. 5 Test Procedure
    1. 5.1 Line/Load Regulation and Efficiency Measurement Procedure
    2. 5.2 Dynamic Output Voltage Transition Measurement Procedure
    3. 5.3 Equipment Shutdown
  7. 6 Performance and Typical Characteristic Curves
    1. 6.1 Efficiency
    2. 6.2 Load Regulation
    3. 6.3 Line Regulation
    4. 6.4 Transient Response
    5. 6.5 Output Ripple
    6. 6.6 Switch-Node Voltage
    7. 6.7 Start and Stop
    8. 6.8 Dymamic Output Voltage Transitions
  8. 7 EVM Assembly Drawing and PCB Layouts
  9. 8 List of Materials
  10. 9 References
  11. 10Revision 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 SW1 switch on the EVM is at the OFF position before VIN and V5IN are applied.
  3. Increase VIN from 0 V to 8 V using V1 to measure input voltage.
  4. Increase V5IN from 0 V to 5 using V2 to measure input voltage.
  5. Turn the SW1 switch to the ON position to enable the controller.
  6. Input 0 V or 3.3 V (DC) to VID0 and VID1 to select VOUT among 0.9 V, 1.0 V, 1.1 V, and 1.2 V.
  7. Vary the load from between 0 ADC to 20 ADC. VOUT should remain in load regulation.
  8. Vary VIN from between 8 V and 20 V. VOUT should remain in line regulation.
  9. Decrease the load to 0 A.
  10. Input 0 V to VID0 and VID1.
  11. Turn the SW1 switch to the OFF position to disable the controller.
  12. Decrease V5IN to 0 V.
  13. Decrease VIN to 0 V.