Re: Searching for engineer experienced in 24V vehicle electrical design.
From: Ge0rge Marutz (gerbermultit00l_at_yahoo.com)
Date: 03/12/05
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Date: 12 Mar 2005 12:25:19 -0800
My intentions were not to waste anyones time. If I did I sincerely
appologize. My original thoughts were that I would meet up with
someone and discuss this outside the forum. However, responses came in
quick and became overwhelming. So, I decided to carry on the
conversation here. Unfortunately I wasn't able to fill in the details
fast enough. That and I need to watch what I say. My company has a
new product coming to market and I do not want to give any of their
trade secrets away.
Back to the matter at hand. The BTS555 is truely a beast!!! I can't
believe they crammed such a device in that small of a package.
About reverse battery connection and this FET. Reverse current may not
damage this part. However, while reverse current flows, my 1 ohm load
will heat up considerably. It may be a few minutes before whomever
installed the product wrong to realize their mistake. By this time the
load could approach 150C. I hate to be so vague, but need to watch
what I say. I have protection mechanisms in place that will prevent
further heating. However, this is destructive. The device will not
recover and would become a warranty return. I would rather prevent
reverse current flow all together.
The good thing is that the BTS555 is packaged in such a small format
that I might be able to place a large body reverse current blocking
diode in series with the load and have some room to spare.
Anyone know of a high current, low forward voltage drop, Schottky diode
in a TO-220 or equivalent package?
George "Gerb" Marutz
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