LED control circuit and method therefor

Details LED control circuit and method therefor LED control circuit and method therefor

2006-04-07

2010-11-23

Wang, Quan-Zhen (Department: 2629)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C345S082000, C345S084000, C345S102000

Reexamination Certificate

active

07839099

ABSTRACT:
In one embodiment, an LED control circuit is configured control a current through an LED responsively to a value that is proportional to a control signal for values of the control signal that are less than a threshold value of the control signal and to control the current to a value that is proportional to the threshold value for values of the control signal that are greater than the threshold value.

REFERENCES:
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patent: 2003/0025465 (2003-02-01), Swanson et al.
patent: 2004/0212321 (2004-10-01), Lys et al.
patent: 2006/0001613 (2006-01-01), Routley et al.
Data Sheet, “High-Efficiency Step-Up Converters for White LED Main and Subdisplay Backlighting, MAX1582/MAS1582Y”, Maxim Integrated Products, #19-2783; Rev 2; Aug. 2005, copyright 2005, 10 pps.
Data Sheet, “FAN5611/FAN5612/FAN5613/FAN5614 Low-Dropout LED Drivers for White, Blue or any Color LED”, Fairchild Semiconductor, Rev. 1.0.4 Jun. 4, 2004, copyright 2004, 12 pps.

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