[SI-LIST] Re: UltraCAD ESR and Bypass Capacitor Caculator
- From: "Jon Keeble" <jkeeble@xxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 12 Aug 2003 15:56:55 +1000
it may be a good idea to put
> the
> bulk capacitors close to the output of the DC-DC converter, otherwise the
> switching ripple current (in the other of a few hundred kHz) will have to
> travel
> all over the board and would spread the switching ripple.
The small amount of 100kHz current still spreads out - to some extent - even
if the convertor and cap are close.
I'd imagine in the same ratios as say DC would i.e. as determined by Ohm's
law applied to planes.
If the switching currents are large (10-20A) then a small ratio may still be
significant.
Jon
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