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From: John Popelish
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X-Mailer: Mozilla 4.7 [en] (Win98; U)
Subject: Re: Help me protect my 7805
Date: Mon, 04 Nov 2002 16:20:21 GMT
NNTP-Posting-Date: Mon, 04 Nov 2002 11:20:21 EST
> I would like to know of a good way to add a short ciruit/overcurrent
> protection circuit to a 7805 regulator. As I understand, simply adding
> a resistor to limit current draw would also affect the measured
The 7805 includes both over current and over temperature protection,
internally. If you wish to make the over current protection
adjustable, that is another matter, though putting a big power
resistor between the power source and the regulator is a crude way to
do that. The regulator will hold the output voltage stable until the
resistor lowers the voltage feed to the chip below about 2 volts
greater than output voltage. Then the output voltage will sag as the
current is increased.
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