SLVUDB4 September   2025

 

  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 Connector, Jumper, DIP switch and Test point Description
      1. 2.1.1 Connector Descriptions
      2. 2.1.2 Jumper Descriptions
      3. 2.1.3 DIP Switch Descriptions
      4. 2.1.4 Test Points Description
      5. 2.1.5 Easy to Use Features
  9. 3Implementation Results
    1. 3.1 Test Setup and Procedure
      1. 3.1.1 Test Setup
      2. 3.1.2 Configurations for Stacking Two EVMs
      3. 3.1.3 Test Procedure
      4. 3.1.4 Precautions
    2. 3.2 Performance Data and Results
      1. 3.2.1 Efficiency
      2. 3.2.2 Steady State Waveforms
      3. 3.2.3 Step Load Response
      4. 3.2.4 AC Loop Response Curve
      5. 3.2.5 Thermal Performance
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layers
    3. 4.3 Bill of Materials
  11. 5Additional Information
    1.     Trademarks

2.1.5 Easy to Use Features

Output Voltage Tracking

Connect analog tracking voltage signal to J8. A high frequency PWM signal is also acceptable because a two-stage RC filter is inserted.

Select Vout between 24V and 45V

  • Populate R91=0Ω and keep R92 unpopulated to set Vout to 24V (default)
  • Populate R92=0Ω and keep R91 unpopulated to set Vout to 45V

Refer to Figure 2-1.

LM5125AEVM-BST Select Vout Between 24V and 45VFigure 2-1 Select Vout Between 24V and 45V

Observe the Inductor Current With Current Probe

Remove R11 and solder a wire in the plated through holes to observe the current through L1 with a current probe. Refer to Figure 2-2.

Similarly, remove R13 and solder a wire to observe the current through L2.

LM5125AEVM-BST Observe L1 Inductor CurrentFigure 2-2 Observe L1 Inductor Current