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-   -   Capacitance Multiplier on SMPS (http://www.diyaudio.com/forums/class-d/123930-capacitance-multiplier-smps.html)

jkeny 28th May 2008 10:55 PM

Capacitance Multiplier on SMPS
 
Has anybody tried this to reduce HF noise on SMPS. AFAIK cap mult acts as an inductor & so HF is attenuated more. Would this be a good way of removing the HF spikes on these PS?

The idea is here: http://www.acoustica.org.uk/t/3pin_reg_notes2.html

Eva 29th May 2008 03:09 PM

Use an inductor...

jkeny 29th May 2008 03:21 PM

But I also need a good bit of capacitance on the power amp PS to aid peak current delivery!

Eva, I take it from your answer that there are no down-sides to its use - just that you think it overkill when an inductor would do? Does the above requirement change this?

Eva 29th May 2008 07:15 PM

An inductor for filtering stuff above 20Khz is not that big, particularly if it is followed by a large capacitance value. The only thing to worry about is the Q of the resulting RLC system, it should be damped. A common-mode filter is even better.

Any good SMPS won't require additional filtering anyway.


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