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Frequency dithering with comparator, PFC controller

Posted: 06 Aug 2014  Print Version  Bookmark and Share

Keywords:switching power supplies  Electromagnetic Interference  EMI  pulse width modulator  TLV3201 comparator 

One of the greatest challenges in designing switching power supplies is limiting its Electromagnetic Interference (EMI) with other electronics. In addition to layout techniques to minimize high di/dt current loop areas and snub high dv/dt nodes, extensive filtering, slowing switching edges, and shielding, dithering the pulse width modulator (PWM) frequency has proven to be an effective way to reduce EMI by changing it from narrowband to broadband. To demonstrate how to design such a dithering circuit, this application note shows a simple example of using a TLV3201 comparator to add dither function to a UCC28180 PFC controller. The circuit used to dither the frequency is accomplished by taking advantage of the UCC28180's internal oscillator.

View the PDF document for more information.

Originally published by Texas Instruments Inc. at www.ti.com as "Frequency Dithering with the UCC28180 and TLV3201".





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