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

4.2.1 Input Connections

  1. Prior to connecting the DC input source VIN and V5IN, it is advisable to limit the source current from VIN to 10 A and from V5IN to 1 A maximum. Make sure VIN and V5IN are initially set to 0 V and connected as shown in Figure 4-2.
  2. Connect a voltmeter V1 at TP5 (VIN) and TP6 (VIN_GND) to measure the input voltage.
  3. Connect a current meter A1 to measure the input current.
  4. Connect a voltmeter V2 at TP1 (V5IN) and TP2 (V5IN_GND) to measure the 5-V input voltage.
  5. Connect a pulse generator to input 2-bit VID signal for dynamic VOUT control. Make sure CH1 outputs 250-Hz, 3.3-VP-P pulse and CH2 outputs 125-Hz, 3.3-VP-P pulse synchronized with CH1. It is advisable to set transition time of the leading and trailing edge between 100 ns and 500 ns.