SLUU535A September   2011  – January 2022 TPS40400

 

  1. 1 Introduction
  2. 2 Description
    1. 2.1 Typical Applications
    2. 2.2 Features
  3. 3 Electrical Performance Specifications
  4. 4 Schematic
  5. 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
      1. 5.2.1 Voltage Source
      2. 5.2.2 Multimeters
      3. 5.2.3 Output Load
      4. 5.2.4 Oscilloscope
      5. 5.2.5 Fan
      6. 5.2.6 Recommended Wire Gauge
    3. 5.3 Recommended Test Setup
    4. 5.4 USB Interface Adapter and Cable
      1. 5.4.1 Input Connections
      2. 5.4.2 Output Connections
      3. 5.4.3 Jumper Connections, JP1 and JP2
      4. 5.4.4 Jumper Configurations
  6. 6 EVM Configuration Using the Fusion GUI
    1. 6.1 Configuration Procedure
    2. 6.2 Fusion GUI Screenshots
  7. 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
  8. 8 Performance Data and Typical Characteristic Curves
    1. 8.1  Efficiency
    2. 8.2  Load Regulation
    3. 8.3  Load Transients 1
    4. 8.4  Load Transient 2
    5. 8.5  Load Transient 3
    6. 8.6  Input and Output Ripple
    7. 8.7  Switch Node and HDRV
    8. 8.8  VIN Turn On
    9. 8.9  Enable ON / OFF
    10. 8.10 Turn ON with 92% (1.1V) Pre-bias
    11. 8.11 TPS40400EVM-351 Bode Plot (20-A output)
  9. 9 EVM Assembly Drawing and PCB Layout
  10. 10List of Materials
  11. 11Revision History

7.2 Control Loop Gain and Phase Measurement Procedure

TPS40400EVM-351 contains a 49.9-Ω series resistor in the feedback loop for loop response analysis.

  1. Set up EVM as described in Section 5.3 and Figure 5-2.
  2. Connect isolation transformer to test points marked TP13 and TP15.
  3. Connect input signal amplitude measurement probe (channel A) to TP13. Connect output signal amplitude measurement probe (channel B) to TP15.
  4. Connect ground lead of channel A and channel B to TP14 and TP16.
  5. Inject 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 may interfere with accuracy of other measurements).