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Old 30th September 2002, 10:02 PM   #11
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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.

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Old 30th September 2002, 10:08 PM   #12
hifi is offline hifi  Sweden
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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 1F 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.

/micke
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