SLUUAQ0C October   2013  – November 2021 TPS53513

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Description
    1. 2.1 Typical Applications
    2. 2.2 Features
  4. 3 Electrical Performance Specifications
  5. 4 Schematic
  6. 5 Test Setup
    1. 5.1 Test Equipment
    2. 5.2 Recommended Test Setup
      1. 5.2.1 Input Connections
      2. 5.2.2 Output Connections
  7. 6 Configurations
    1. 6.1 Switching Frequency Selection
    2. 6.2 Mode Selection
    3. 6.3 VDD Pin Supply Selection
  8. 7 Test Procedure
    1. 7.1 Line/Load Regulation and Efficiency Measurement Procedure
    2. 7.2 Control Loop Gain and Phase Measurement Procedure
    3. 7.3 List of Test Points
    4. 7.4 Equipment Shutdown
  9. 8 EVM Assembly Drawing and PCB Layout
  10. 9 List of Materials
  11. 10Revision History

7.2 Control Loop Gain and Phase Measurement Procedure

The TPS53513EVM-PWR587 contains a 10-Ω series resistor in the feedback loop for loop response analysis.

  1. Set up the EVM as described in Section 5 and Figure 5-2.
  2. Connect the isolation transformer to test points marked TP5 and TP8.
  3. Connect input signal amplitude measurement probe (channel A) to TP10. Connect the output signal amplitude measurement probe (channel B) to TP11.
  4. Connect ground lead of channel A and channel B to TP15.
  5. Inject around 20-mV or less signal through the isolation transformer.
  6. Sweep the frequency from 100 Hz to 1 MHz with 10 Hz or lower post filter. The control loop gain and phase margin can be measured.
  7. Disconnect the isolation transformer from bode plot test points before making other measurements (signal injection into feedback may interfere with accuracy of other measurements).