[SI-LIST] Re: Power handling

Hassan,

Why are you using 2 ounce planes?  That complicates PCB fabrication.  I use
three 1/2 ounce planes for this very same purpose all the time.  Make the power
planes the same weight  as the signal layers to make fabrication as easy as
possible.

Also, I'd put a via in parallel with the plated through hole for every 3 amps of
current.  That is good redundancy and costs you little if anything.  All you
need is cracking at the barrel surface interface and you lose the connection if
you only have one plated hole.

Lee

Michael Nudelman wrote:

> It seems OK.
>
> BTW, SynQor (power supply mfr) wrote good paper on pin-to-plane (including
> thermals) temperature behaviour.         Check it out on their site.
>
> Mike.
>
> -----Original Message-----
> From: Hassan Ali [mailto:hali@xxxxxxxxxxxxxx]
> Sent: Monday, November 26, 2001 4:37 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Power handling
>
> This is a little off the signal integrity field, but it concerns PCB design.
>
> Each pin of a power connector (diameter = 3.75mm) that is to be mounted on a
> PCB is expected to carry a current of up to 25A of the -48V supply. I was
> just wondering if  tapping off the power to three 2oz power planes would be
> sufficient. I would appreciate any comments on that. My concern is the
> effect of the small plane-pin contact area and the high current (8A per
> contact area).
>
> Thanks.
>
> Hassan.
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