SNVU891 February   2025 LM25137 , LM25137-Q1 , LM25137F-Q1 , LM5137 , LM5137-Q1 , LM5137F , LM5137F-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 Specifications
      1. 1.3.1 Application Circuit Diagrams
    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
      3. 2.1.3 Recommended Test Setup
        1. 2.1.3.1 Input Connections
        2. 2.1.3.2 Output Connections
      4. 2.1.4 Test Procedure
        1. 2.1.4.1 Line and Load Regulation, Efficiency
  9. 3Implementation Results
    1. 3.1 Test Data and Performance Curves
      1. 3.1.1 Efficiency
      2. 3.1.2 Operating Waveforms
        1. 3.1.2.1 Load Transient Response
        2. 3.1.2.2 Start-Up and Shutdown With VIN
        3. 3.1.2.3 Start-Up and Shutdown With ENABLE ON and OFF
        4. 3.1.2.4 Switching Operation
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
      1. 4.2.1 Component Drawings
      2. 4.2.2 Layout Guidelines
    3. 4.3 Bill of Materials
  11. 5Additional Information
    1. 5.1 Trademarks
  12. 6Device and Documentation Support
    1. 6.1 Device Support
      1. 6.1.1 Development Support
    2. 6.2 Documentation Support
      1. 6.2.1 Related Documentation
        1. 6.2.1.1 Low-EMI Design Resources
        2. 6.2.1.2 PCB Layout Resources
        3. 6.2.1.3 Thermal Design Resources

1.1 Introduction

The LM5137F-Q1-EVM12V evaluation module (EVM) is a two-phase, synchronous, buck DC/DC regulator that employs synchronous rectification to achieve high conversion efficiency in a small footprint. The EVM operates over a wide input voltage range of 36V to 72V, providing a regulated single output of 12V. The output voltage has better than 1% setpoint accuracy and is adjustable by modifying the feedback resistor values, permitting the user to customize the output voltage within a range of 3.3V to 20V as needed. Alternatively, as shown in Figure 1-2, the EVM is configurable as a dual-output design (at 10A per output) by changing the COMP network configuration, the CNFG resistor, and removing the shorting element between the VOUT1 and VOUT2 power connectors.

Inherent protection features for robust design include input supply voltage, VCC and gate-drive UVLO; independent IMON, PG and FAULT indicator outputs for each channel; resistor-adjustable soft start; hiccup-mode overcurrent protection; and thermal shutdown with hysteresis. The selected power-train passive components, including 80V power MOSFETs, 5.6μH buck inductors, 4mΩ shunts, 4.7μF, 100V ceramic input capacitors and 22μF, 25V ceramic output capacitors – are AEC-Q200 rated and available from multiple component vendors.

The EVM design uses the LM5137F-Q1 buck controller IC, which is specifically developed for functional safety applications and incorporates the following key features:

  • Wide VIN range up to 80V maximum
  • 100% duty cycle capability
  • Ultra-low shutdown (4µA) and no-load standby (15µA) quiescent currents
  • Multiphase capability
  • Peak current-mode control loop architecture with slope compensation
  • Integrated, high-current MOSFET gate drivers with adaptive deadtime
  • Optional dual-random spread spectrum (DRSS) modulation for lower EMI
  • Independent current monitor (IMON), power-good (PG) and FAULT indicator outputs on each channel