SLOA343 August   2024 TPS543820 , TPS543A22 , TPSM843620 , TPSM843A22

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Layout Techniques to Reduce EMI
    1. 2.1 Placement of Passive Components
    2. 2.2 Ground Flooding
    3. 2.3 Minimize Number of Antennas
    4. 2.4 Via Stitching
    5. 2.5 Additional Steps to Minimize Impedance or Noise
  6. 3Designing for EMI-Optimized Layout
  7. 4Test Results for Radiated Interference
  8. 5EMI Filtering
  9. 6Summary
  10. 7References

Test Results for Radiated Interference

The following data was taken in the CISPR Chamber with CISPR32 pre-compliant setup. These results are not officially CISPR certified. The table below shows a summary of the experimental setup for each set of tests. A photo of the setup is shown in Figure 4-1. The results show a significant improvement in the radiated emissions, showing that EMI can be heavily reduced by changing only the layout.

Table 4-1 Testing Conditions
ICVinVoutIoutSwitching Frequency
TPS54382012V1.2V8A500kHz
TPSM84362012V1.2V6A500kHz
TPS543A2212V1.2V10A500kHz
TPSM843A2212V1.2V10A500kHz
 Radiated Emissions Testing SetupFigure 4-1 Radiated Emissions Testing Setup
 TPS543620 EVM ResultsFigure 4-2 TPS543620 EVM Results
 TPSM843620 EVM ResultsFigure 4-4 TPSM843620 EVM Results
 TPS543B22 EVM ResultsFigure 4-6 TPS543B22 EVM Results
 TPSM843B22 EVM ResultsFigure 4-8 TPSM843B22 EVM Results
 TPS543820 EMI-Optimized ResultsFigure 4-3 TPS543820 EMI-Optimized Results
 TPSM843620 EMI-Optimized ResultsFigure 4-5 TPSM843620 EMI-Optimized Results
 TPS543A22 EMI-Optimized ResultsFigure 4-7 TPS543A22 EMI-Optimized Results
 TPSM843A22 EMI-Optimized ResultsFigure 4-9 TPSM843A22 EMI-Optimized Results