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Reply-To: "fred bartoli"
From: "fred bartoli"
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Subject: Re: Help - Power mosfets - difficult load
Date: Mon, 28 Oct 2002 15:05:00 +0100
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Organization: Guest of ProXad - France
NNTP-Posting-Date: 28 Oct 2002 15:03:26 MET
John Popelish a écrit dans le message :
> Bill Allison wrote:
> > John Popelish wrote:
> > > unless the battery were right next to the control circuits. Making
> > > the control circuit to be bolted directly to the battery would be even
> > > better,
> > It will be as nearly so as makes no odds.
> > >and eliminate most of the supply side bypass requirement.
> > But still need some? battery self-inductance?
> The internals of the battery have very little inductance, but any
> conductor has something like a nanohenry per foot, and if this
In case of non coupled force/return path, the loop inductance is on the
order (sligthly less than) of mu0 which is about 1.25uH/m !!!
The ordinary retained value is 1nH/mm which is 300nH/foot. Far above your
Even a 50ohm coax (that have a fair amount of coupling) has a loop
inductance on the order of 50^2*100pF/m = 250nH/m, which is 75nH/foot.
Update your figures, John!
> conductor surrounds an area, there is a bit more. For normal signals,
> this would be nothing to think about, but with 100 amp pulses, even
> that low value can have significant consequences and be worth checking
> John Popelish
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