[SI-LIST] Re: Traces under converters - bad mojo or myth?
- From: Ivor Bowden <ivor@xxxxxxxxxxx>
- To: bobperl@xxxxxxxxx
- Date: Wed, 13 Nov 2002 10:26:31 -0800
The main problem we had with DC-DC converters on PCBs was the noise on
the feed got into everything. LOTS of decoupling right at the input and
a separate low impedance path to the connector power input pins was what
it took to quite things down. Didn't seem to have any problems from the
magnetics. We kept the signal traces away and used a 6 layer
(sig-plane-sig-sig-plane-sig) stackup. ymmv.
-Ivor
Bob Perlman wrote:
> Hi -
>
> For those of you who have worked with DC-DC converters, either the
> bricks or SIPs: do you have any experience with running traces inside
> the PCB under the magnetics? Have you seen significant noise on the
> traces that can be attributed to the converters? Are intervening
> power/ground planes at all effective as shields?
>
> I know it's a rather general question. "It depends..." (plus a few
> more words of wisdom) is a perfectly good answer.
>
> Thanks,
> Bob Perlman
> Cambrian Design Works
>
>
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