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From: "Ken Taylor"
Subject: Re: A protection problem
Date: Wed, 8 Jan 2003 08:43:31 +1300
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"Ken Smith" wrote in message
> I'm currently working on a voltage regulator with a major protection
> problem. The specs are:
> Input voltage 23 to 28V. This is easy enough.
> Output voltage DAC controled 0 to 25V (doesn't need to boost make 25V when
> input is too low). This isn't too hard.
> Output current limited at 100mA. This isn't too hard.
> Some moron may hook a (+) or (-) 600V supply to the output. This 600V
> supply can supply a zillion amps so MOVs aren't the answer. PTC devices
> don't seem to be able to handle this case either.
> I'm tinkering with various active circuits but they all seem to end up
> with quite a few parts in them. Does anyone have an idea?
> firstname.lastname@example.org forging knowledge
If a fuse isn't going to do the trick, shouldn't you be looking at designing
the system so it *can't* be hooked up to 600V? Prevention being worth
several pieces of cure.
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