SNVU898A May   2024  – October 2024

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 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
  7. 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
  8. 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
        2. 3.1.2.2 Line Transient Response
        3. 3.1.2.3 Start-Up and Shutdown With VIN
      3. 3.1.3 CISPR 25 EMI Performance
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
      1. 4.2.1 Component Drawings
    3. 4.3 Bill of Materials
  10. 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
  11. 6Additional Information
    1. 6.1 Trademarks
  12. 7Revision History

3.1.3 CISPR 25 EMI Performance

Figure 3-7 presents the EMI performance of the LM25148B-Q1 EVM at 12V input with active EMI and DRSS mitigation techniques enabled. Conducted emissions are measured over a frequency range of 150kHz to 30MHz using a 5µH LISN according to the CISPR 25 low-frequency specification. CISPR 25 Class 5 peak and average limit lines are denoted in red. The yellow and green spectra are measured using peak and average detection, respectively.

LM25148B-Q1EVM-2100 CISPR 25 Class 5 Conducted Emissions Plot, 150kHz to 30MHz, VIN = 12V, IOUT = 8A Resistive Load Figure 3-7 CISPR 25 Class 5 Conducted Emissions Plot, 150kHz to 30MHz, VIN = 12V, IOUT = 8A Resistive Load