A circuit and method of dithering the switching frequency of an off-line power factor corrected (PFC) pre-regulator. The circuitry used to dither the frequency is advantageously accomplished by taking advantage of the PWM's internal timing circuitry. This invention reduces narrow band EMI and eliminates the need to provide specialty PWM controllers to achieve dithering.

 
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> DC/DC converter with inductor current sensing capability

~ 00335