Patent ID: 8305004

Claim:
An integrated circuit, comprising: a power factor corrector controller operable to receive, at a first input node, a rectified input voltage waveform of an input AC signal, and operable to generate a drive signal; a switch coupled to the power factor corrector controller, and operable, in response to the drive signal, to generate an output current across a power distribution circuit, wherein the output current varies in phase with the rectified input voltage waveform during a first mode, and is substantially constant during a second mode, wherein the power distribution circuit is operable during the second mode to distribute a substantially constant power throughout at least a portion of the integrated circuit; and an input voltage feedforward system coupled to the first input node and a current-sensing node of the power factor corrector controller, and operable, in the first and second modes, to provide a constant voltage to the current-sensing node of the power factor corrector controller, wherein the first mode is when the input AC signal is near line zero crossing, and the second mode is when the input AC signal is near peak line voltage.