SLVUCX1 September   2024 TPS548B23

 

  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 Configurations and Modifications
      1. 2.1.1 Multifunction Configuration (CFG1-5) Pins Selection
      2. 2.1.2 Setting Output Voltage Using External Feedback Configuration
  9. 3Implementation Results
    1. 3.1 Test Setup and Results
      1. 3.1.1 Input and Output Connections
      2. 3.1.2 Efficiency
      3. 3.1.3 Output Voltage Regulation
      4. 3.1.4 Load Transient and Loop Response
      5. 3.1.5 Output Voltage Ripple
      6. 3.1.6 Start-up and Shutdown with EN
      7. 3.1.7 Thermal Performance
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 Board Layout
      1. 4.2.1 Layout
    3. 4.3 Bill of Materials
  11. 5Additional Information
    1. 5.1 Trademarks

3.1.2 Efficiency

The efficiency on the TPS548B23EVM is shown in Figure 3-1 and Figure 3-2. The test points used for the efficiency measurement are listed in Table 3-4. Use these test points to minimize the contribution of PCB parasitic power loss to the measured power loss.

The following are some additional test setup considerations to minimize external sources of power dissipation.

  • Do not measure the SW pin with TP14 while measuring the efficiency. Measuring the SW pin with this test point loads this node with 500Ω and the efficiency measurement includes the power lost in this external resistance.

Table 3-3 Efficiency Measurement Test Points
TEST POINT NAME REFERENCE DESIGNATOR FUNCTION
VIN_S TP1 Input voltage test point connected near pins
PGND_S TP18 PGND reference test point for input voltage
VOUT_S TP2 Output voltage test point near output inductor
PGND_S TP19 PGND reference test point for output voltage
TPS548B23EVM Efficiency – PFM ModeFigure 3-1 Efficiency – PFM Mode
TPS548B23EVM Efficiency – FCCM Mode (Default)Figure 3-2 Efficiency – FCCM Mode (Default)