SLVU728A May   2012  – December 2021 TPS53318 , TPS53319

 

  1. 1 Introduction
    1. 1.1 Typical Applications
    2. 1.2 Features
  2. 2 Electrical Performance Specifications
  3. 3 Schematic
  4. 4 Test Setup
    1. 4.1 Test Equipment
    2. 4.2 Recommended Test Setup
  5. 5 Configurations
    1. 5.1 Switching Frequency Selection
    2. 5.2 Soft Start Selection
    3. 5.3 Mode Selection
    4. 5.4 Enable Selection
  6. 6 Test Procedure
    1. 6.1 Line/Load Regulation and Efficiency Measurement Procedure
    2. 6.2 Control Loop Gain and Phase Measurement Procedure
    3. 6.3 List of Test Points
    4. 6.4 Equipment Shutdown
  7. 7 Performance Data and Typical Characteristic Curves
    1. 7.1  Efficiency
    2. 7.2  Load Regulation
    3. 7.3  Line Regulation
    4. 7.4  Enable Turn-On/ Turn-Off
    5. 7.5  Output Ripple
    6. 7.6  Switching Node
    7. 7.7  Output Transient with Auto-skip Mode
    8. 7.8  Output Transient with FCCM mode
    9. 7.9  Output 0.75-V Pre-bias Turn-On
    10. 7.10 Output Overcurrent and Short Circuit Protection
    11. 7.11 Bode plot
    12. 7.12 Thermal Image
  8. 8 EVM Assembly Drawing and PCB Layout
  9. 9 Bill of Materials
  10. 10Revision History

6.2 Control Loop Gain and Phase Measurement Procedure

TPS53319EVM-136 contains a 10Ω series resistor in the feedback loop for loop response analysis.

  1. Set up EVM as described in Section 4 and Figure 4-2.
  2. Connect isolation transformer to test points marked TP6 and TP7.
  3. Connect input signal amplitude measurement probe (channel A) to TP6. Connect output signal amplitude measurement probe (channel B) to TP7.
  4. Connect ground lead of channel A and channel B to TP9.
  5. Inject around 20mV or less signal through the isolation transformer.
  6. Sweep the frequency from 100Hz to 1MHz with 10Hz 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 may interfere with accuracy of other measurements).