Constant current driver circuit with voltage compensated...

Details Constant current driver circuit with voltage compensated... Constant current driver circuit with voltage compensated...

G - Physics

05

F

G05F 1/46 (2006.01) G05F 1/575 (2006.01) H02M 3/00 (2006.01) H05B 33/08 (2006.01)

Patent

CA 2638485

A current sensing circuit for sensing the current provided to LEDs by a constant current power source includes a resistive shunt in series with the load and a current mirror having a first leg connected to a first terminal of the resistive shunt and a second leg connected to a second terminal of the resistive shunt. Both legs of the current mirror are also connected to ground. The first leg provides a reference signal to the second leg, and the second leg uses the reference signal and a voltage at the second terminal of the resistive shunt to provide a ground referenced output signal indicative of the current provided to the LEDs.

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