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From: "Spehro Pefhany"
Subject: Re: An interesting little prob.
References: <email@example.com> <firstname.lastname@example.org>
User-Agent: tin/pre-1.4-19990216 ("Styrofoam") (UNIX) (Linux/2.2.14 (i586))
Date: Wed, 30 Oct 2002 12:50:51 GMT
NNTP-Posting-Date: Wed, 30 Oct 2002 07:50:51 EST
The renowned Tony Williams wrote:
> Thinking aloud Speff. The stability of that closed-loop
> voltage regulator will almost certainly be load-dependant.
> eg, It will oscillate with (say) a big capacitive load.
Yes.. I do think so..
> Since this is primarily a precision current-source I can
> accept a less-than-perfect programmable voltage clamp
> in the interests of it being load-independant.
> In which case maybe a voltage-clamping output stage
> along the lines of below would be more suitable.
I like this a *lot* better. My ruminations over coffee
were going along the lines of trying to alter the
frequency response in line with the varying current
as well as isolating the (implied) load capacitance.
> + From const-I source
> "Vout" | \|/
> \ \ |
> \ / +--->Iout
> \ \ |
> \ | |
> F/B<--/\/\--------+ |
> _|_ _|_
> \_/<-- \_/ <-- Schottky pair in
> | | a TO-220 package
> | \ |/e
> | >-/\/\------------|pnp
> | / |\
Schottkys are very leaky, especially when warm, depending
on how long you can allow for the output Z to rise to
>1M this may or may not be an issue. With your 1V spec you
could use a nice fat silicon diode, of course.
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