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Thread: Making an analog power supply digital...
www.piclist.com/techref/ubicom/lib/io/index.htm?key=ato+analog
BY : johncouture


In SX Microcontrollers, SX/B compiler and SX-Key Tool, johncouture wrote:

Interesting topic.

Couldn't you use a LM117/LM317  (Adjustable Regulator, 1.5A, 1.2V to 37V range) and a digital pot (DS1803)
With R1 at 1000 and R2 a 10K variable pot you could go from about 2.0 to 15V
LM317 calculator
http://spazioinwind.libero.it/andreabinello/lm317-lm337/index.html
Higher amps available as LM150, 3A and LM138, 5A
A couple of reference articles:

High Side Current-Sense Measurement: Circuits and Principles (MAXIM)
http://www.maxim-ic.com/appnotes.cfm/appnote_number/746/

Making a shunt from 12ga wire
http://www.uoguelph.ca/~antoon/gadgets/shunts/shunts.html

LM117 Datasheet
http://cache.national.com/ds/LM/LM117.pdf

DS1803 Datasheet
http://datasheets.maxim-ic.com/en/ds/DS1803.pdf

... Or did I misunderstand the whole concept?

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