Safe-constant-current-source


Posted on Nov 12, 2012    11371

In the circuit shown, a CMOS op amp controls the current through a p-channel HEXFET power transistor to maintain a constant voltage across RL The current is given by: 1 ~ VREF/Rl.


Safe-constant-current-source
Click here to download the full size of the above Circuit.

The advantages of this configuration are: (a) in the event of a component failure, the load current is limited by Rl; and (b) the overhead voltage needed by the op amp and the HEXFET is extremely low.




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