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From: John Popelish
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X-Mailer: Mozilla 4.7 [en] (Win98; U)
Subject: Re: Help - Power mosfets - difficult load
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <3DB81206.E28CA99F@rica.net> <email@example.com>
Date: Fri, 25 Oct 2002 15:34:25 GMT
NNTP-Posting-Date: Fri, 25 Oct 2002 11:34:25 EDT
Bill Allison wrote:
> FYI and FWIW, I now know that my motor has a DC resistance of 32
> millohms (not nearly as low as I feared) and the battery 10 when new
> so I'm feeling more encouraged that this can work...
That means that these resistances limit the peak current to less than
285 amps, but it also implies that at something like that current, the
battery voltage must drop to at least 9 volts, which is beginning to
get risky as a gate driving voltage. As the battery gets tired, this
will obviously go down. Just something ot keep in mind when thinking
through the design.
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