|30th September 2002, 09:02 PM||#11|
The one and only
The importance in size of the first cap is a function of
the ripple current and ripple voltage. If you have too
small a cap, both ripples will give you headaches.
On the second cap of a pi filter, large size contributes
to low noise and instantly available current. You don't
want to skimp here, either.
In practice, I just assign equal values on both sides and
ramble on to the next problem.
(Steve Martin Ramblin' Guy Icon)
|30th September 2002, 09:08 PM||#12|
Join Date: Mar 2001
But then again an inductor needs to have ripple across it to function?
I didnt mean to have an osurdly small cap first but like 50% of the last one. and not the otherway around.
I did some simulations of using a 1µF cap first... (in a CLCLCLC filter ) and as i recall it was better to use only CLCLC with equal values. so i guess that agreass with what you are saying.
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