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

6.4 CISPR 25 EMI Performance

Figure 6-13 presents the EMI performance of the LM5149-Q1 EVM at 48-V input with Active EMI and DRSS mitigation techniques enabled. Conducted emissions are measured over a frequency range of 150 kHz to 30 MHz using a 5-µH 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.

Figure 6-13 CISPR 25 Class 5 Conducted Emissions Plot, 150 kHz to 30 MHz, VIN = 48 V, IOUT = 5-A Resistive Load