SLVAF18 March   2021 TPSM5601R5H

 

  1.   Trademarks
  2. 1Noise Origin
    1. 1.1 Parasitic Elements
    2. 1.2 High Frequency Noise and Low Frequency Ripple
  3. 2Effective Construction of a Power Module
    1. 2.1 Noise Reduction
    2. 2.2 TPSM5601R5H Step-Down Power Module
  4. 3Spread Spectrum
    1. 3.1 Concept
    2. 3.2 Tradeoffs
    3. 3.3 Other EMI Mitigation Techniques
    4. 3.4 EMI Results
  5. 4Summary
  6. 5References

4 Summary

EMI can enter a system (or device) through either conduction or radiation, or both. Conducted EMI occurs from the normal operation of switching circuits. The ON and OFF actions of the power switches generate large discontinuous currents and pass noise to the output as low frequency ripple and high frequency noise. In EMI-sensitive applications it is important to begin the design with components that have great EMI performance. Texas Instrument’s Enhanced HotRod package technology and power modules are great solutions when it comes to EMI performance.

To further optimize EMI performance, implementing spread-spectrum architecture offers a simple and cost effective solution for the average EMI noise reduction by reducing harmonic peaks and spreading the noise energy. As a result, the measured radiated and conducted peak emissions are reduced, however, the total-noise energy is unchanged and other bands can be negatively affected depending on the application.