SLVUCY3 October   2024 LM65680-Q1

 

  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
    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, Load Regulation, and Efficiency
  8. 3Implementation Results
    1. 3.1 Performance Data and Results
      1. 3.1.1 EVM Characteristics
      2. 3.1.2 Conversion Efficiency
      3. 3.1.3 Operating Waveforms
        1. 3.1.3.1 Switching
        2. 3.1.3.2 Load Transient Response
        3. 3.1.3.3 Short-Circuit Recovery
        4. 3.1.3.4 Start-Up and Shutdown With EN
        5. 3.1.3.5 Start-Up With VIN
      4. 3.1.4 Bode Plot
      5. 3.1.5 CISPR 25 EMI Performance
      6. 3.1.6 Thermal Performance
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
      1. 4.2.1 Component Drawings
      2. 4.2.2 Multi-Layer Stackup
    3. 4.3 Bill of Materials
  10. 5Compliance Information
    1. 5.1 Compliance and Certifications
  11. 6Related Documentation
    1. 6.1 Supplemental Content
      1. 6.1.1 Development Support
      2. 6.1.2 PCB Layout Resources
      3. 6.1.3 Thermal Design Resources
  12. 7Additional Information
    1. 7.1 Trademarks

3.1.5 CISPR 25 EMI Performance

The EMI performance of the LM65680-Q1 EVM at 24V and 48V input with DRSS EMI mitigation disabled are shown in Figure 3-12 and Figure 3-13. Conducted emissions are measured over a frequency range of 150kHz to 108MHz using a 5µH LISN according to the CISPR 25 specification. CISPR 25 Class 5 peak and average limit lines are denoted in red. The purple and green spectra are measured using peak and average detection, respectively.

Figure 3-12 CISPR 25 Class 5 Conducted Emissions Plot, 150kHz to 108MHz,
VIN = 24V, VOUT = 5V, IOUT = 8A Resistive Load, FSW = 400kHz
Figure 3-13 CISPR 25 Class 5 Conducted Emissions Plot, 150kHz to 108MHz,
VIN = 48V, VOUT = 5V, IOUT = 8A Resistive Load, FSW = 400kHz