SLYY200A April   2021  – December 2023 LM25149 , LM25149-Q1 , LM5156-Q1 , LM5157-Q1 , LM53635-Q1 , LM60440-Q1 , LM61460-Q1 , LM61495-Q1 , LMQ62440-Q1 , LMR33630-Q1 , LMS3655-Q1 , TPS55165-Q1 , UCC12040 , UCC12050

 

  1.   1
  2.   Overview
  3.   At a glance
  4.   What is EMI?
  5.   Conventional methods to reduce EMI in the low- and high-frequency ranges
  6.   Innovations in reducing low-frequency emissions
  7.   Spread spectrum
  8.   Active EMI filtering
  9.   Cancellation windings
  10.   Innovations in reducing high-frequency emissions
  11.   HotRod™ package
  12.   Enhanced HotRod QFN
  13.   Integrated input bypass capacitor
  14.   True slew-rate control
  15.   EMI modeling capabilities
  16.   Low-frequency EMI designs using WEBENCH® design tool
  17.   Conducted and radiated EMI results published in data sheets
  18.   Conclusion
  19.   Keep product categories for low EMI

At a glance

1 What is EMI?
EMI is electromagnetic energy — produced as an undesirable byproduct of switching currents and voltages — that comes from a variety of physical phenomena and manifests during stringent EMI tests.
2 Conventional methods to reduce EMI in the low- and high-frequency ranges
Reducing EMI is an endeavor plagued with trade-offs. Conventional methods to reduce EMI include using large, expensive filters or reducing switching slew rates, a technique that directly impacts efficiency.
3 Innovations in reducing low-frequency emissions
To realize all of the benefits of a switchmode power supply, it is paramount for EMI reduction techniques to resolve the traditional trade-offs. This requires creative solutions for both low- and high-frequency EMI, as well as accurate modeling techniques.