From: Jason White <whitewaterssoftwareinfo@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Wed, 12 Feb 2020 07:17:47 -0800
Subject: Re: [EE] TL431+NPN as rated series regulator? Circuit questions.
Thread-Topic: [EE] TL431+NPN as rated series regulator? Circuit questions.
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Texas instruments

On Wednesday, February 12, 2020, Sean Breheny <shb7@cornell.edu> wrote:

> Which manufacturer's TL431 datasheet is this from? I presume they meant
> 2N2222 not 2N222 (an ancient germanium transistor)
>
> On Tue, Feb 11, 2020, 12:35 PM Jason White <
> whitewaterssoftwareinfo@gmail.com wrote:
>
> > Hello everyone,
> >
> > The TL431 datasheet shows the attached circuit has an example of how
> > to create a series regulator.
> >
> > I would like some help understanding the purpose of C1, RA, and RB.
> >
> > I assume RA is to prevent oscillation?
> > What is C1's purpose? Why is C1 from cathode to reference? (to prevent
> > oscillation?)
> > What is RB's purpose? (to improve turn off time?)
> >
> > --
> > Jason White
> > --
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