TIDT445 May   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Load Transient Test Circuit
    3. 2.3 Highlighted Products
      1. 2.3.1 LM5137F-Q1 Overview
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
    3. 3.3 Test Results
      1. 3.3.1 Efficiency Data
      2. 3.3.2 Efficiency Graphs
      3. 3.3.3 Output Voltage Ripple
      4. 3.3.4 Thermal Images
      5. 3.3.5 Bode Plots
      6. 3.3.6 Load Transients
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 Altium Project
      4. 4.1.4 Gerber Files
      5. 4.1.5 Assembly Drawings
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  11. 5About the Author

Description

This reference design describes a four-phase interleaved Buck converter. Using LM5137F-Q1 as a controller enables the converter with three options for functional safety: Capable, ASIL B, and ASIL D. The converter operates over a wide range of 6.5V to 36V to deliver 4.5V regular outputs with better than 1% set-point accuracy at load currents up to 42A per output. The converter applies dynamic phase shedding to get 81% efficiency at 15mA per output and also can achieve ±8.3% output voltage vibration when output current jumps from 21A to 86A in 1μs.