[SI-LIST] Re: Pulse current handling capability of PCB
- From: "Kevin G. Rhoads" <kgrhoads@xxxxxxxxxxxx>
- Date: Tue, 15 Sep 2009 19:05:41 +0000
>Twenty microseconds is short enough to design according to the
>ADIABIATIC temperature rise of the conductor -- joules/area,
Yes, definitely adiabatic. But the current level is high enough
that inductive coupling, ground bounce and Lorentz forces must
all be considered IMHO. Where is the return? Will ground levels
shift enough to trip/trigger anything? Considering the current and
the return geometries, what sort of magnetic exposures could be an
issue to anything else? Are there nearby ferromagnetic materials
that could be permanently magnetized or demagnetized? Or twisted,
bent, moved?
Is there anyway the inrush charging could be slowed? Do you really
need to do 100A for 20microseconds or could this just be spread in
time?
And what sort of wear will it cause at contacts?
I don't have answers, just I think the questions need to range wider.
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