SLUUCO2 August   2022 TPSM8D6B24

 

  1.   Abstract
  2.   Trademarks
  3. 1 Description
    1. 1.1 Before You Begin
    2. 1.2 Features
  4. 2 Electrical Performance Specifications
  5. 3 Schematic
  6. 4 Test Setup
    1. 4.1 Test and Configuration Software
      1. 4.1.1 Description
      2. 4.1.2 Features
    2. 4.2 Test Equipment
      1. 4.2.1 Voltage Source
      2. 4.2.2 Oscilloscope
      3. 4.2.3 Multimeters
      4. 4.2.4 Output Load
      5. 4.2.5 Fan
      6. 4.2.6 USB-to-GPIO Interface Adapter
      7. 4.2.7 Recommended Wire Gauge
    3. 4.3 List of Test Points, Jumpers, and Connectors
    4. 4.4 Evaluating Split Rail Input
  7. 5 EVM Configuration Using the Fusion GUI
    1. 5.1 Configuration Procedure
  8. 6 Test Procedure
    1. 6.1 Line and Load Regulation and Efficiency Measurement Procedure
    2. 6.2 Efficiency Measurement Test Points
    3. 6.3 Control Loop Gain and Phase Measurement Procedure
  9. 7 Performance Data and Typical Characteristic Curves
    1. 7.1 Efficiency
    2. 7.2 Load Regulation
    3. 7.3 Line Regulation
    4. 7.4 Transient Response
    5. 7.5 Control Loop Bode Plot
    6. 7.6 Output Ripple
    7. 7.7 Control On
    8. 7.8 Control Off
    9. 7.9 Thermal Image
  10. 8 EVM Assembly Drawing and PCB Layout
  11. 9 Bill of Materials
  12. 10Using the Fusion GUI
    1. 10.1  Opening the Fusion GUI
    2. 10.2  General Settings
    3. 10.3  Changing ON_OFF_CONFIG
    4. 10.4  Pop-Up for Some Commands While Conversion is Enabled
    5. 10.5  SMBALERT# Mask
    6. 10.6  Device Info
    7. 10.7  Phase Commands
    8. 10.8  All Config
    9. 10.9  Pin Strapping
    10. 10.10 Monitor
    11. 10.11 Status

6.2 Efficiency Measurement Test Points

To evaluate the efficiency of the power train (device and inductor), it is important to measure the voltages at the correct location, which because otherwise the measurements include losses that are not related to the power train itself. Losses incurred by the voltage drop in the copper traces and in the input and 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. Output current can be measured anywhere in the output wires of the output being measured.

Table 6-1 shows the measurement points for input voltage and output voltage. VIN 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 6-1 Test Points for Efficiency Measurements
Test PointNode NameDescriptionComment
VOUT_A
TP1PVINInput voltage measurement point for VIN+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.
TP3 PGNDInput voltage measurement point for VIN– (GND)
TP6VOUT_AOutput 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.
TP10PGNDOutput voltage measurement point for VOUT– (GND)
VOUT_B
TP1PVINInput voltage measurement point for VIN+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.
TP2PGNDInput voltage measurement point for VIN– (GND)
TP18VOUT_BOutput 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.
TP22PGNDOutput voltage measurement point for VOUT– (GND)