Capacitance Multiplier on SMPS

jkeny · 28th May 2008, 10:55 PM

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.

28th May 2008, 10:55 PM	#1
jkeny Banned Join Date: Feb 2007 Location: Dublin	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

29th May 2008, 03:09 PM	#2
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Use an inductor... __________________ I use to feel like the small child in The Emperor's New Clothes tale

29th May 2008, 07:15 PM	#4
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	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. __________________ I use to feel like the small child in The Emperor's New Clothes tale

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29th May 2008, 03:21 PM	#3
jkeny Banned Join Date: Feb 2007 Location: Dublin	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?

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