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Re: Two LM317 in parallel

C

Costas Vlachos

Jan 1, 1970
0
Ivar Eriksen said:
Is it possible to place two LM317 in parallel in order to increase wattage?
I got a bunch of LM 317T's wich is rated at 1.5 amps, and i need about 5
amps for an fan control circuit.

(I know an PWM circuit would be more efficent but i need to read the strobe
pulse)



It is possible to parallel LM317s, but you can't simply connect their pins
together. A few more componenets are needed. Have a look at:

http://www.national.com/ds/LM/LM117.pdf

There is a typical app that shows how to do it. You could also use a pass
element to increase the output current. Check the typical apps in the above
data sheet.

Regards,
Costas
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