07759881 is referenced by 170 patents and cites 153 patents.

A light emitting diode (LED) lighting system includes a controller to control current in one or more LEDs in response to a dimming level input. The LED lighting system implements a dimming strategy having two modes of operation that allow the LED lighting system to dim the LEDs using an active value of an LED current less than a full value LED current while maintaining continuous conduction mode operation. In an active value varying mode of operation, the controller varies an active value of the LED current for a first set of dimming levels. In an active value, duty cycle modulation mode of operation, the controller duty cycle modulates an active value of the LED current for a second set of dimming levels. In at least one embodiment, the active value of the LED current varies from a full active value to an intermediate active value as dimming levels decrease.

Title
LED lighting system with a multiple mode current control dimming strategy
Application Number
12/58971
Publication Number
7759881 (B1)
Application Date
March 31, 2008
Publication Date
July 20, 2010
Inventor
John L Melanson
Austin
TX, US
Agent
Kent B Chambers
Hamilton & Terrile
Assignee
Cirrus Logic
TX, US
IPC
H05B 37/02
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