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Constant current source using linear regulator.

MalcolmB

New Member
Hi all. The subject says it all. How do I use a linear regulator as a constant current source.
Thanks very much.
 

danadak

Well-Known Member
Most Helpful Member
Not knowing your requirements, or compliance needed, or accuracy or....

we have a simple example -

1655138416863.png



Regards, Dana.
 

crutschow

Well-Known Member
Most Helpful Member
Would help greatly to know your requirements so we can give a better answer.
 

crutschow

Well-Known Member
Most Helpful Member
That LM317 circuit has a voltage drop of about 3V when operating near the limit of the current-limit setting.

Is that okay for your application?
 

crutschow

Well-Known Member
Most Helpful Member
For your possible interest, below is the LTspice simulation of the LM317 circuit set for a 1A limit, with the output lead resistance decreasing with time until the limit is reached.

1655232297945.png
 

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