Patent ID: 7492108
Filing Date: 2009-02-17
Classification: H05B,Y02B

Abstract:
1. A circuit comprising: a switch current regulator, including a first transistor, coupled to a current control signal input, the switch current regulator configured to control a current provided to a light-emitting diode (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 using a second different transistor, the switching voltage regulator configured to provide current to the LED; and a sensor coupled to the switch current regulator, the LED, and a signal feedback circuit, the sensor configured to measure status information regarding the switch current regulator and the LED and provide the status information to a controller via the signal feedback circuit, wherein the status information is used to adjust the voltage on the current control signal input, wherein the sensor comprises