US Patent 7492108 System and method for driving light-emitting diodes (LEDs)

Patent 7492108 was granted and assigned to Texas Instruments on February, 2009 by the United States Patent and Trademark Office.

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Patent

Patent attributes

Current Assignee

Texas Instruments

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7492108

Date of Patent

February 17, 2009

Patent Application Number

11201505

Date Filed

August 11, 2005

Patent Primary Examiner

Douglas W Owens

Patent abstract

System and method for improving efficiency in driving LEDs. A preferred embodiment comprises a switch current regulator coupled to a current control signal input, the switch current regulator to control an amount of current provided to the LED based upon a magnitude of a voltage on the current control signal input, a switching voltage regulator coupled to the switch current regulator and the LED, the switching voltage regulator to provide current to the LED, and a sensor coupled to the switch current regulator, the LED, and a signal feedback circuit, the sensor to measure status information regarding the switch current regulator and the LED and provides the information to a controller, wherein the status information can be used to adjust the current on the current control signal input.

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