Patent ID: 7492108

Claim:
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 an LED voltage sensor coupled to an anode terminal of the LED and a cathode terminal of the LED, the LED voltage sensor configured to measure a voltage drop across the LED, and an LED current sensor coupled to the LED, the LED current sensor configured to measure a current flowing through the LED.