Reduce EMI by varying power supply frequency

by Robert Kollman, Senior Applications Manager, Texas Instruments , Power Management DesignLine, Feb 04 2009

Focus:
Modulating the switching frequency, also known as spread spectrum frequency modulation, can lower EMI at specific frequencies by spreading the noise over the frequency spectrum.

What you’ll learn:

• How to modulate power supply switching frequency to change emission signature from narrowband to broadband noise
• How to choose modulating frequency and frequency shift when modulating the switching frequency to suppress EMI

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