SLUU522A August   2011  – January 2022 TPS53355

 

  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
    2. 4.2 Recommended Test Setup
  6. 5 Configurations
    1. 5.1 Switching Frequency Selection
    2. 5.2 Soft-Start Selection
    3. 5.3 Mode Selection
    4. 5.4 Enable Selection
  7. 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 Test Point List
    4. 6.4 Equipment Shutdown
  8. 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 Prebias Turn-On
    10. 7.10 Output Overcurrent and Short-Circuit Protection
    11. 7.11 Bode Plot
    12. 7.12 Thermal Image
  9. 8 EVM Assembly Drawing and PCB Layout
  10. 9 Bill of Materials
  11. 10Revision History

6.2 Control Loop Gain and Phase Measurement Procedure

The TPS53355EVM-743 contains a 10-Ω series resistor in the feedback loop for loop response analysis.

  1. Set up the EVM as described in Section 4 and Figure 4-2.
  2. Connect isolation transformer to test points marked TP10 and TP11.
  3. Connect input signal amplitude measurement probe (channel A) to TP10. Connect output signal amplitude measurement probe (channel B) to TP11.
  4. Connect ground lead of channel A and channel B to TP12.
  5. Inject an approximate 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).