SNVU589A December   2017  – January 2022 TPS53119

 

  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
  7. 6 Configurations
    1. 6.1 Switching Frequency Selection
    2. 6.2 Soft-Start Selection
    3. 6.3 Mode Selection
    4. 6.4 Enable 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 Performance Data and Typical Characteristic Curves
    1. 8.1 Efficiency
    2. 8.2 Load Regulation
    3. 8.3 Output Transient
    4. 8.4 Output Ripple
    5. 8.5 Switching Node
    6. 8.6 Enable Turn-On/Turn-Off
    7. 8.7 Output 1.1-V Prebias Turn-On
    8. 8.8 Bode Plot
    9. 8.9 Thermal Image
  10. 9 EVM Assembly Drawing and PCB Layout
  11. 10Bill of Materials
  12. 11Revision History

7.2 Control Loop Gain and Phase Measurement Procedure

The TPS53119EVM-690 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 a isolation transformer to test points marked TP9 and TP10.
  3. Connect an input signal amplitude measurement probe (channel A) to TP9. Connect an output signal amplitude measurement probe (channel B) to TP10.
  4. Connect the ground lead of channel A and channel B to TP11.
  5. Inject approximately 40-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 isolation transformer from bode plot test points before making other measurements (Signal injection into feedback can interfere with accuracy of other measurements).