SNVU820 February   2022 LM5149-Q1

 

  1.   Trademarks
  2. 1High Density EVM Description
    1. 1.1 Typical Applications
    2. 1.2 Features and Electrical Performance
  3. 2EVM Characteristics
  4. 3Application Circuit Diagram
  5. 4EVM Photo
  6. 5Test Setup and Procedure
    1. 5.1 EVM Connections
    2. 5.2 Test Equipment
    3. 5.3 Recommended Test Setup
      1. 5.3.1 Input Connections
      2. 5.3.2 Output Connections
    4. 5.4 Test Procedure
      1. 5.4.1 Line and Load Regulation, Efficiency
  7. 6Test Data and Performance Curves
    1. 6.1 Conversion Efficiency
    2. 6.2 Operating Waveforms
      1. 6.2.1 Switching
      2. 6.2.2 Load Transient Response
      3. 6.2.3 Line Transient Response
      4. 6.2.4 Start-Up and Shutdown With EN
      5. 6.2.5 Start-Up and Shutdown with VIN
    3. 6.3 Bode Plot
    4. 6.4 CISPR 25 EMI Performance
    5. 6.5 Thermal Performance
  8. 7EVM Documentation
    1. 7.1 Schematic
    2. 7.2 List of Materials
    3. 7.3 PCB Layout
    4. 7.4 Component Drawings
  9. 8Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
        1. 8.2.1.1 PCB Layout Resources
        2. 8.2.1.2 Thermal Design Resources

1 High Density EVM Description

The LM5149-Q1EVM-400 high-density EVM is designed to use a regulated or non-regulated high-voltage input rail ranging from 15 V to 72 V to produce a tightly regulated output voltage of 12 V at load currents up to 8 A. This wide VIN range DC/DC solution offers outsized voltage rating and operating margin to withstand supply rail voltage transients.

The free-running switching frequency is 400 kHz and is synchronizable to an external clock signal at a higher or lower frequency. The power-train passive components selected for this EVM, including buck inductors and ceramic input and output capacitors, are automotive AEC-Q200 rated and are available from multiple component vendors.