Efficient controlled current sink for led backlight panel

Details Efficient controlled current sink for led backlight panel Efficient controlled current sink for led backlight panel

G - Physics

02

F

G02F 1/13357 (2006.01) H05B 33/08 (2006.01) H05B 37/00 (2006.01)

Patent

CA 2324423

A circuit for controlling current flow though an LED backlight network, comprising a PWM circuit for receiving an input DC voltage (Vsource) and in response generating a chopped output voltage (Vsw), a filter for smoothing the output voltage (Vsw) resulting in a DC output voltage (Vout) for application to a first terminal of the LED backlight network. A resistance (Rcp) is connected between ground and a second terminal of the LED backlight network so as to create a node voltage (Vref) connected to a feedback input of the PWM circuit. In operation, the PWM circuit maintains a constant controlled current through the LED backlight network by regulating Vout in accordance with the node voltage (Vref).

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