SLUUBE4B February   2016  – August 2021 TPS548D22

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Description
    1. 2.1 Typical End-User Applications
    2. 2.2 EVM Features
  4. 3 EVM Electrical Performance Specifications
  5. 4 Schematic
  6. 5 Test Equipment
  7. 6 The PWR-784EVM
  8. 7 List of Test Points, Jumpers, and Switch
  9. 8 Test Procedure
    1. 8.1 Line and Load Regulation Measurement Procedure
    2. 8.2 Efficiency
    3. 8.3 Equipment Shutdown
  10. 9 Performance Data and Typical Characteristic Curves
    1. 9.1 Efficiency
    2. 9.2 Load Regulation
    3. 9.3 Line Regulation
    4. 9.4 Transient Response
    5. 9.5 Output Ripple
    6. 9.6 Control On
    7. 9.7 Control Off
    8. 9.8 Thermal Image
  11. 10EVM Assembly Drawing and PCB Layout
  12. 11List of Materials
  13. 12Revision History

8.2 Efficiency

To measure the efficiency of the power train on the EVM, it is important to measure the voltages at the correct location. This is necessary because otherwise the measurements will include losses in efficiency 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, and they must not be included in efficiency measurements.

Table 8-2 List of Test Points for Efficiency Measurements
TEST POINTNODE NAMEDESCRIPTION
TP2LocS+Sense VOUT + locally across C5. Use for efficiency and ripple measurements
TP10LocS-Sense VOUT - locally across C5. Use for efficiency and ripple measurements
TP4PVINSense VIN + across C10
TP13PGNDSense VIN - across C10

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. Using these measurement points result in efficiency measurements that do not include losses due to the connectors and PCB traces.