SLVUDZ7 September   2026 LM25139-Q1

 

  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
      1. 1.3.1 Application Circuit Diagram
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Test Setup and Procedure
      1. 2.1.1 EVM Connections
      2. 2.1.2 Test Equipment
  9. 3Implementation Results
    1. 3.1 Test Data and Performance Curves
      1. 3.1.1 Conversion Efficiency
      2. 3.1.2 Operating Waveforms
        1. 3.1.2.1 Load Transient Response
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials
  11. 5Device and Documentation Support
    1. 5.1 Device Support
      1. 5.1.1 Development Support
    2. 5.2 Documentation Support
      1. 5.2.1 Related Documentation
        1. 5.2.1.1 PCB Layout Resources
        2. 5.2.1.2 Thermal Design Resources
  12. 6Additional Information
    1. 6.1 Trademarks

2.1.2 Test Equipment

Voltage Source: Use an input voltage source capable of supplying 0V to 36V and 20A.

Multimeters:

  • Voltmeter 1: Input voltage at VIN+ to GND.
  • Voltmeter 2: Output voltage at VOUT to GND.
  • Ammeter 1: Input current.
  • Ammeter 2: Output current.

Electronic Load: The load must be an electronic constant-resistance (CR) or constant-current (CC) mode load capable of 0 Adc to 20 Adc at 5V. For a no-load input current measurement, disconnect the electronic load as this can draw a small residual current.

Oscilloscope: With the scope set to AC coupling, measure the output voltage ripple directly across an output capacitor with a short ground lead normally provided with the scope probe. Place the oscilloscope probe tip on the positive terminal of the output capacitor, holding the ground barrel of the probe through the ground lead to the negative terminal of the capacitor. TI does not recommend using a long-leaded ground connection because this can induce additional noise given a large ground loop. To measure other waveforms, adjust the oscilloscope as needed.

Integrated Load Transient Generator: A load transient generator is provided on the EVM. Connect a suitable pulse generator to the "LOAD_STEPPER_GATE" SMB connector and adjust the load current pulse amplitude and duration as desired, while monitoring the voltage at J2. A 20mΩ sense resistor (RSTEPPER) is used, providing a scale factor of 20mV/A. The pulse duty cycle must be kept low to avoid damaging the MOSFET. The output voltage is monitored directly across the output capacitors. TI recommends the use of a high speed differential probe.

Safety: Always use caution when touching any live or energized circuits.