Wednesday, 8 July 2015

Ripple reduction with LC filter


This seems like it must be a common problem but I don't find a clear answer anywhere, maybe my approach is wrong.


I have a DC-DC regulator in my circuit, which has a ripple of 50mV at 200kHz, the current draw is 500mA, voltage output 5V. I want to add a lowpass LC filter to reduce this. https://upload.wikimedia.org/wikipedia/commons/e/eb/Lowpass_Filter_LC.svg


However I struggle at determining which values I should selected, is there a standard approach in determining these values based on the ripple frequency or otherwise, or how should I go about determining these?


Cheers Sam




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