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

4.1.2 Efficiency Measurement Test Points

Measure the voltages at the correct location to evaluate the efficiency of the power train (device and inductor). This action is necessary because otherwise the efficiency measurements include losses that are not related to the power train. Losses incurred by the voltage drop in the copper traces and input and output connectors are not related to the efficiency of the power train, which must not be included in efficiency measurements.

Input current is measured between the input supply and EVM input in the input wires, and output current is measured in the output wires between the EVM and load

Table 5-1 shows the measurement points for input and output voltage. VIN and VOUT are measured to calculate the dc-dc converter efficiency. Using the VIN and VOUT measurement points results in efficiency measurements that excluded losses due to the wires and connectors.

Table 4-1 Test Points for Efficiency Measurements
Test Point Node Name Description Comment
PVIN_SNS+ PVIN_SNS Input voltage measurement point for PVIN The pair of test points are connected to the PVIN/PGND pins of U1. The voltage drop between input terminal to the device pins is included for efficiency measurement.
PVIN_SNS- PGND_SNS Input voltage measurement point for PGND
VOUT_RMT VOUT_RMT Output voltage measurement point for VOUT The pair of test points are connected near the output terminals. The voltage drop from the output point of the inductor to the output terminals is included for efficiency measurement.
GND_RMT GND_RMT Output voltage measurement point for PGND

For more accurate efficiency measurements of the power train, remove the voltage drop between the power train and the terminals from the measurement. Using the test points in Table 5-2 reduces these losses.

Table 4-2 Test Points for Better Efficiency Measurements
Test Point Node Name Description Comment
PVIN_SNS+ PVIN_SNS Input voltage measurement point for PVIN The pair of test points are connected to the PVIN/PGND pins of U1. The voltage drop between input terminal to the device pins is included for efficiency measurement.
PVIN_SNS- PGND_SNS Input voltage measurement point for PGND
VOUT_EFF VOUT_EFF Output voltage measurement point for VOUT This pair of test points are connected to VOUT and GND near the output inductor for U1 and U1 PGND .
GND_EFF GND_EFF Output voltage measurement point for PGND