[SI-LIST] : Re: Backplane Board insertion problem

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From: Dennis Schmitz ([email protected])
Date: Wed Dec 06 2000 - 08:30:56 PST

We removed all components from the power section of the board, except for
the fuses. We suspect that the capacitance of the power planes on the board
itself pings the backplane causing the resonant response.

----- Original Message -----
From: "Mendelsohn, Joseph P (Joseph)" <[email protected]>
To: "si-list" <[email protected]>
Cc: "'Dennis Schmitz'" <[email protected]>
Sent: Wednesday, December 06, 2000 11:14 AM
Subject: Backplane Board insertion problem

> I would tend to agree with Mark. You probably do not have enough
> capacitance in the backplane, or you do not have an inrush(soft-start)
> circuit. There are many ways to avoid this problem. Check out the
> following brief in EDN
> http://www.ednmag.com/ednmag/reg/1997/121897/26di_07.htm
> <http://www.ednmag.com/ednmag/reg/1997/121897/26di_07.htm> . This type of
> circuit or, a simple MOSFET with a set RC time constant can help.
> Joseph
> -----Original Message-----
> From: Mark Gill [mailto:[email protected]]
> Sent: Wednesday, December 06, 2000 9:22 AM
> To: 'Dennis Schmitz'; si-list
> Subject: RE: [SI-LIST] : Capacitor dielectric type
> Dennis -
> Your board insertion problem sounds more like an in-rush current problem
> than power plane resonance. Do you have further details which would
> resonance over inrush?
> Mark
> -----Original Message-----
> From: Dennis Schmitz [mailto:[email protected]]
> Sent: Tuesday, December 05, 2000 5:38 PM
> To: si-list
> Subject: Re: [SI-LIST] : Capacitor dielectric type
> Can some kind person please point me to some references on power-plane
> resonance? I am researching for a new backplane design of an existing
> where we are having some problems with board insertion causing
> on the power distribution planes.
> Thanks in advance.

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