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Date: Fri, 17 Jan 2003 09:35:01 -0700
From: Jim Drew
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Subject: Re: PIC controlled variable power supply
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Spehro Pefhany wrote:
> Use your PWM output or R-2R ladder to generate a voltage. Buffer the
> voltage with a unity-gain op-amp and feed it to the adjust pin on an
> LM317 as so.
> 0---- IN Out -------x----->
> adj 240R
> | |
> Op -------x
> This gets you short circuit and overtemperature protection, and
> the cost will be very low.
I was under the impression from the data sheets on the LM317 that the
adjust pin can sink up to the output level in current. Normally just
resistors are used for the adjustment, and these are required to be
values that can handle the power. Is this not correct?
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