Patent ID: 7598682

Claim:
An apparatus, comprising: a regulating unit, the regulating unit operable in a power mode and in a setback mode, the regulating unit configured to receive current from a voltage source, the regulating unit flows current onto an LED during the power mode; a switch control in electronic communication with the regulating unit to control the regulating unit to flow regulated current onto the LED during the power mode and to flow substantially no current onto the LED during the setback mode, wherein the regulating unit comprises: a switch, the switch having an ON state and an OFF state, the switch in the ON state allows the LED to receive current from the voltage source, the switch in the OFF state substantially disconnects the LED from the voltage source, the switch in electronic communication with the switch control such that the switch control may place the switch in the ON state and in the OFF state; an inductor, the inductor in electronic communication with the LED, the inductor in the electronic communication with the switch, the inductor stores current from the voltage source when the switch is in the ON state, current flows from the inductor onto the LED when switch is in the OFF state; wherein the switch control further comprises: a duty cycle control, the duty cycle control generates a duty cycle control signal indicative of the power mode and the setback mode; and the switch control configured to generate a switch control signal in response to a current sensor signal, a timing signal, and the duty cycle control signal, the switch control signal toggles the switch between the ON state and the OFF state.