Driving circuit for light emitting diodes

Details Driving circuit for light emitting diodes Driving circuit for light emitting diodes

2005-10-11

2005-10-11

Lee, Wilson (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S224000, C315S307000, C323S234000

Reexamination Certificate

active

06954039

ABSTRACT:
An LED driving circuit includes a current limiting resistor (24), an FET (22), and a feedback circuit (23). The FET has a drain electrode connected to the current limiting resistor to provide current to a load such as an LED (25), and the feedback circuit has a variable reference voltage source (234) for controlling a current of the drain electrode of the FET.

REFERENCES:
patent: 4160934 (1979-07-01), Kirsch
patent: 5025204 (1991-06-01), Su
patent: 5175748 (1992-12-01), Takahashi
patent: 6097360 (2000-08-01), Holloman
patent: 6690146 (2004-02-01), Burgyan et al.
patent: 6734639 (2004-05-01), Chang et al.
patent: 2002/0047642 (2002-04-01), Miyagawa
patent: 2003/0086457 (2003-05-01), Theodoras

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