Re: What is the reason for R7 in 317 regulator ?

From: Rok Sitar (Rok.Sitar_at_uni-mb.si)
Date: 08/04/04 

Date: Wed, 4 Aug 2004 08:09:35 +0200

R7 is in the circuit for Iadj. Take the time end read the instructions!
"Roy McCammon" <rbmccammon@mmm.com> wrote in message
news:411006EC.5020306@mmm.com...
> little billy wrote:
> > Hello,
> >
> > Does anyone know the 5A COnstant Volatge/Constant Current Regulator
> > from the LM117/LM317A/LM317 regulator, it's on page 16 and is
> > downloadable from
> >
> > http://www.national.com/ds.cgi/LM/LM117.pdf
> >
> > I am curious as to the reason from R7=220.
> > What will happen if we put R7=0R ?
>
> I haven't analyzed it, but I think it may be necessary
> for stability. Without it, the opamp looks like it
> would be driving a capacitive load.
>
> --
> local optimization seldom leads to global optimization
>
> my e-mail address is: <my first name> <my last name> AT mmm DOT com
>