SLUUD52 August   2024 TPS544E27

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
      1. 1.1.1 Before You Begin
    2. 1.2 Kit Contents
    3. 1.3 Specifications
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Test Equipment
      1. 2.1.1 Voltage Source
      2. 2.1.2 Oscilloscope
      3. 2.1.3 Multimeters
      4. 2.1.4 Output Load
      5. 2.1.5 Fan
      6. 2.1.6 USB-to-GPIO Interface Adapter:
      7. 2.1.7 Recommended Wire Gauge
    2. 2.2 List of Test Points, Jumpers, and Connectors
    3. 2.3 Efficiency Measurement Test Points
    4. 2.4 Control Loop Gain and Phase Measurement
    5. 2.5 External 5V Bias to Enhance Efficiency
    6. 2.6 Input Current Measurement
  9. 3Software
    1. 3.1 Opening the PMBus® Fusion GUI
    2. 3.2 Monitor Page
    3. 3.3 Status Page
  10. 4Implementation Results
    1. 4.1 Performance Data and Typical Characteristics Curves
  11. 5Hardware Design Files
    1. 5.1 Schematic
    2. 5.2 PCB Layout
    3. 5.3 Bill of Materials
  12. 6Additional Information
    1. 6.1 Trademarks

2.3 Efficiency Measurement Test Points

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

Input current can be measured at any point in the input wires, and output current can be measured anywhere in the output wires of the output being measured.

Table 2-4 shows the measurement points for input voltage and output voltage. PVIN and VOUT are measured to calculate the efficiency. Using these measurement points results in efficiency measurements that excluded losses due to the wires and connectors.

Table 2-4 Test Points for Efficiency Measurements
Test PointNode NameDescriptionComment
TP6PVIN_EFFInput 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 not included for efficiency measurement.
TP7PGND_EFFInput voltage measurement point for PVIN– (PGND)
TP9VOUT_EFFOutput 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 not included for efficiency measurement.
TP20PGND_EFFOutput voltage measurement point for VOUT– (GND)