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From: John Popelish
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X-Mailer: Mozilla 4.7 [en] (Win98; U)
Subject: Re: three-terminal regulator question
Date: Wed, 08 Jan 2003 22:59:11 GMT
NNTP-Posting-Date: Wed, 08 Jan 2003 17:59:11 EST
Ernst Baumgartner wrote:
> is it possible to connect a few (say four) three-terminal regulator ic's
> (such as 78xx) in series in order to obtain a higher output voltage?
> Thank you!
These regulators produce an output voltage that is some fixed voltage
above their reference pin (that is normally grounded), as long as the
output is a couple volts less than the voltage on the input pin. If
you use one regulator to produce a voltage higher than zero to act as
the reference, then the regulator connected to that elevated reference
will produce an elevated output (assuming there is sufficient supply
voltage). However, this sort of operation may defeat the over
temperature and over current protection functions, which expect the
output current ot go to zero as the output voltage approaches the
reference voltage and this in not the case when the reference is fixed
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