Patent ID: 8232736

Claim:
An apparatus comprising: a power factor correction (PFC) and LED drive controller, wherein the controller is an integrated circuit, the controller comprising: a digital signal processor, coupled to the LED feedback node and configured to: operate from a digital level supply voltage; generate a PFC control signal; and generate an LED current control signal; a first buffer, coupled to the processor, and configured to: operate from a medium level supply voltage, wherein the medium level supply voltage is greater than the digital level supply voltage; receive the PFC control signal; and convert the PFC control signal into a PFC switch control signal to control conductivity of a PFC switch; and a second buffer, coupled to the processor, and configured to: operate from the medium level supply voltage; receive the LED current control signal; and convert the LED current control signal into an LED current control switch signal to control conductivity of an LED current control switch.