SLUUB60B May   2015  – August 2021 TPS544B25 , TPS544C25

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Description
    1. 2.1 Typical End-User Applications
    2. 2.2 EVM Features
  4. 3 EVM Electrical Performance Specifications
  5. 4 Schematic
  6. 5 Test Setup
    1. 5.1 Test and Configuration Software
      1. 5.1.1 Description
      2. 5.1.2 Features
    2. 5.2 Test Equipment
    3. 5.3 The PWR-681EVM
    4. 5.4 List of Test Points, Jumpers ans Switch
  7. 6 EVM Configuration Using the Fusion GUI
    1. 6.1 Configuration Procedure
  8. 7 Test Procedure
    1. 7.1 Line/Load Regulation Measurement Procedure
    2. 7.2 Efficiency
    3. 7.3 Bode Plot Measurement Procedure
    4. 7.4 Equipment Shutdown
  9. 8 Performance Data and Typical Characteristic Curves
    1. 8.1  Efficiency
    2. 8.2  Load Regulation
    3. 8.3  Line Regulation
    4. 8.4  Transient Response
    5. 8.5  Output Ripple
    6. 8.6  Control On
    7. 8.7  Control Off
    8. 8.8  Overcurrent Protection
    9. 8.9  Control Loop Bode Plot
    10. 8.10 Thermal Image
  10. 9 Fusion GUI
  11. 10EVM Assembly Drawing and PCB Layout
  12. 11List of Materials
  13. 12Revision History

7.3 Bode Plot Measurement Procedure

  1. Follow Section 7.1 to set VIN and Load to desired operating condition.
  2. Connect the AC small signal injection out of isolation transformer to test points TP2 and TP3.
  3. Connect input signal amplitude measurement probe (Channel A) to TP3.
  4. Connect output signal amplitude measurement probe (Channel B) to TP2.
  5. Connect ground lead of Channel A and Channel B to TP10.
  6. Inject 10 mV or less signal through the isolation transformer.
  7. Sweep the frequency from 500 Hz to 500 kHz with 10-Hz or lower post filter.
  8. Control loop gain can be measured by 20 x log (ChannelB/ChannelA).
  9. Control loop phase can be measured by the phase difference between Channel A and Channel B.
  10. Follow Section 7.4 to power off the device.