SLVUCF0A june   2022  – may 2023

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Background
  5. 2Quick Start
  6. 3EVM Connections
  7. 4Schematic
  8. 5PCB Layout
  9. 6Test Data and Performance Curves
    1. 6.1 Efficiency and Load Regulation Performance
    2. 6.2 Waveforms
    3. 6.3 Thermal Performance
    4. 6.4 EMI Performance
  10. 7Bill of Materials
  11. 8Custom Design With WEBENCH® Tools
  12. 9Revision History

6.4 EMI Performance

Figure 6-11 through Figure 6-15 provide peak and average EMI waveforms for passing CISPR 25 Class 5 EMI specifications. Both conducted and radiated emissions were evaluated on the LMR54450QEVM.

To pass CISPR 25 Class 5 Automotive radiated emissions, an EMI shield was added to the EVM. Unless otherwise indicated, Vin = 13.5 V, Vout = 5 V, Iout = 5 A, and Fsw = 400 kHz.

GUID-20230404-SS0I-JCCZ-F2LD-QDHJTX8SBF8R-low.png
Vin = 13.5 VOUT = 5 V Iout = 5 A
Figure 6-11 CISPR 25 Class 5 Conducted Emissions
GUID-20230404-SS0I-XBBT-KKXV-TMR03G212T1V-low.png
Vin = 13.5 VOUT = 5 V Iout = 5 A
Figure 6-12 CISPR 25 Class 5 Radiated Emissions: Monopole
GUID-20230404-SS0I-ZH7T-MN15-1VDCM0FZQC7P-low.png
Vin = 13.5 VOUT = 5 V Iout = 5 A
Figure 6-13 CISPR 25 Class 5 Radiated Emissions: Biconical Horizontal Polarization
GUID-20230404-SS0I-FVGT-28CP-W6JZ3PHGCSM8-low.png
Vin = 13.5 VOUT = 5 V Iout = 5 A
Figure 6-14 CISPR 25 Class 5 Radiated Emissions: Biconical Vertical Polarization
GUID-20230404-SS0I-VTKN-P1WM-W2VNLZKGMK6B-low.png
Vin = 13.5 VOUT = 5 V Iout = 5 A
Figure 6-15 CISPR 25 Class 5 Radiated Emissions: Log Periodic