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From: "Phil Allison"
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <3DB5EEF9.BF30CE32@rica.net> <firstname.lastname@example.org>
Subject: Re: Help - Power mosfets - difficult load
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Date: Wed, 23 Oct 2002 21:50:17 +1000
NNTP-Posting-Date: Wed, 23 Oct 2002 21:41:24 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Bill Allison" wrote in message
> Re your latest - I understand that the low frequency will give time
> for the current to overshoot the average, but will the losses due to
> that be dissipated in the fet or in the schottky?
** The max peak current may exceed the device maximum under worst
case - that is the major issue with 50 Hz pulses.
My concern, because> of their cost, is to minimise the risk of blowing the
fets. I'm not
> that concerned about overall efficiency.
** Nor was I - but it is smart to keep all parameters inside
And as I've said, 50Hz is> conveniently to hand and I suspect won't be that
terrible with my
> large motor.
** That is the worry - it may be with only two fets in parallel.
. . .. . . ............... Phil Allison ( a nice guy )
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