SAFE_CONSTANT_CURRENT_SOURCE

Published:2009/7/9 3:28:00 Author:May | From:SeekIC

In the circuit shown, a CMOS op amp controls the current through a p-channel HEXFET power transistor to maintain a constant voltage across R1. The current is given by: 1 = VREF/R1. The advantages of this configuration are: (a) in the event of a component failure, the load current is limited by R1; and (b) the overhead voltage needed by the op amp and the HEXFET is extremely low.



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