SNVU923B December   2024  – December 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 EVM Characteristics, Test Point, and Connector Description
      1. 2.1.1 EVM Characteristics
      2. 2.1.2 EVM Connectors and Test Points
  9. 3EVM Configurations
    1. 3.1 Output Voltage Tracking
    2. 3.2 Device Configuration
  10. 4Implementation Results
    1. 4.1 Test Setup and Procedure
      1. 4.1.1 Test Setup
      2. 4.1.2 Test Procedure and Equipment
      3. 4.1.3 Precautions
  11. 5Application Curves
    1. 5.1 Efficiency
    2. 5.2 Steady State Waveforms
  12. 6Hardware Design Files
    1. 6.1 Schematic
    2. 6.2 PCB Layers
    3. 6.3 Bill of Materials
  13. 7Additional Information
    1. 7.1 Trademarks
  14. 8Revision History

3.1 Output Voltage Tracking

Section 3.1 describes how to setup the evaluation module for dynamic output voltage tracking.

The LMG5126EVM is typically configured to have fixed output voltage of 24V. Figure 3-1 shows the resistor from the ATRK, DTRK pin to the analog ground sets the output voltage to 24V. RATRK is R11 referring to the schematic.

LMG5126EVM Fixed Output Voltage ConfigurationFigure 3-1 Fixed Output Voltage Configuration

To dynamically change the output voltage by analog signal, RATRK is removed and the ATRK, DTRK pin voltage is driven directly to change the output voltage. See the LMG5126 Wide-Input, 2.5MHz, Boost Converter data sheet for selecting the voltage range and setting the ATRK pin voltage to produce the desired output voltage. Figure 3-2 shows the configuration to change the output voltage dynamically by applying voltage or supplying analog signal.

LMG5126EVM Variable Output Voltage Configuration via analog signalFigure 3-2 Variable Output Voltage Configuration via analog signal

Applying an analog voltage of around 0.8V and 1.5V to the ATRK, DTRK pin sets the output voltage of 24V and 45V respectively.

To dynamically change the output voltage digitally, RATRK is removed and the ATRK/DTRK pin is fed a PWM signal directly to change the output voltage. See the LMG5126 Wide-Input, 2.5MHz, Boost Converter data sheet for setting the PWM duty cycle of DTRK pin voltage to produce the desired output voltage. Figure 3-3 shows the configuration to change the output voltage dynamically by applying a digital signal.

LMG5126EVM Variable Output Voltage Configuration via digital signalFigure 3-3 Variable Output Voltage Configuration via digital signal

Applying a PWM signal on the ATRK/DTRK pin with duty cycle of 32% and 60%, sets the output voltage to 24V and 45V, respectively.