SLUUCZ3 July   2024 TPS546E25

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Test Setup
      1. 2.1.1 Test and Configuration Software
        1. 2.1.1.1 Description
        2. 2.1.1.2 Features
      2. 2.1.2 Test Equipment
        1. 2.1.2.1 Voltage Source
        2. 2.1.2.2 Multimeters
        3. 2.1.2.3 Output Load
        4. 2.1.2.4 Oscilloscope
        5. 2.1.2.5 Fan
        6. 2.1.2.6 USB-to-GPIO Interface Adapter:
        7. 2.1.2.7 Recommended Wire Gauge
      3. 2.1.3 Tip and Barrel Measurement
      4. 2.1.4 List of Test Points, Jumpers, and Connectors
      5. 2.1.5 Configuring EVM to Overdrive VDRV
    2. 2.2 Best Practices
  9. 3Software
    1. 3.1 EVM Configuration Using the Fusion GUI
      1. 3.1.1 Configuration Procedure
    2. 3.2 Using the Fusion GUI
      1. 3.2.1 Opening the Fusion GUI
      2. 3.2.2 Changing ON_OFF_CONFIG
      3. 3.2.3 SMBALERT# Mask
      4. 3.2.4 All Config
      5. 3.2.5 Pin Strapping
      6. 3.2.6 Monitor
      7. 3.2.7 Status
  10. 4Implementation Results
    1. 4.1 Test Procedure
      1. 4.1.1 Line and Load Regulation and Efficiency Measurement Procedure
      2. 4.1.2 Efficiency Measurement Test Points
      3. 4.1.3 Control Loop Gain and Phase Measurement Procedure
    2. 4.2 Performance Data and Typical Characteristic Curves
      1. 4.2.1 Efficiency
      2. 4.2.2 Transient Response
      3. 4.2.3 Control Loop Bode Plot
      4. 4.2.4 Output Ripple
      5. 4.2.5 Control On
      6. 4.2.6 Control Off
      7. 4.2.7 Control On With Prebiased Output
      8. 4.2.8 Thermal Image
  11. 5Hardware Design Files
    1. 5.1 Schematic
    2. 5.2 EVM Assembly Drawing and PCB Layout
    3. 5.3 Bill of Materials
  12. 6Additional Information
    1.     Trademarks

4.1.3 Control Loop Gain and Phase Measurement Procedure

The TPS546E25EVM-1PH includes a 10Ω series resistor in the feedback loop for VOUT. The resistor is accessible at the test points VOSNS and CHB for loop response analysis. Use the test points during loop response measurements as the perturbation injecting points for the loop. See the description in Table 5-3.

Table 4-3 List of Test Points for Loop Response Measurements
Test Point Node Name Description Comment
CHB CH2 Input to feedback divider of VOUT The amplitude of the perturbation at this node must be limited to less than TBDmV
VOSNS CH1 Resulting output of VOUT Bode can be measured by a network analyzer with a CH2/CH1 configuration

Measure the loop response with the following procedure:

  1. Set up the EVM as described in Section 2.1.2.
  2. For VOUT, connect the isolation transformer of the network analyzer from CHB to VOSNS.
  3. Connect the input signal measurement probe for CH1 to VOSNS. Connect the output signal measurement probe for CH2 to CHB.
  4. Connect the ground leads of both probe channels to AGND.
  5. On the network analyzer, measure the Bode plot as CHB/VOSNS (CH2/CH1).