piclist 2001\01\26\082814a >
Thread: Shunt regulator? 317/337 solution
face BY : Roman Black email (remove spam text)

Alan B. Pearce wrote:
> >You are not going to get short circuit
> >protection from a shunt reg anyway so the extra
> >cost of a regulator chip is not justified. :o)
> I always understood that shunt regulators were inherently short circuit
> protected by the series impedance they need to do the regulation. If you S/C the
> output the current flow is limited by the impedance, and if open circuit the
> shunt regulator needs to be able to sink the total design load current plus what
> it needs to maintain regulation.

Hi Alan, you may be thinking of current regulation?
A shunt regulator fixes the output voltage by
drawing off excess current that the load does not
require, with no series resistor etc needed.
If the load becomes faulty, max current is limited
only by the impedance of the psu, which probably
has big caps!! Normally the regulator ICs like
317 etc are nice because of the current limiting,
but using one as a shunt reg will not utilise this
benefit, so you may as well use a transistor. :o)

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See also: www.piclist.com/techref/index.htm?key=shunt+regulator
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