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

1.2 High Frequency Noise and Low Frequency Ripple

The noise elements that are coupled onto the output voltage are high-frequency noise and low-frequency ripple. The low frequency ripple is a byproduct of the inductor ripple current and output capacitor(s) impedance. The high frequency noise is generated by the high di/dt current and any inductance in its path (input capacitor and power switches).