Patent ID: 6956336

Claim:
An integrated circuit for an electronic ballast control, comprising: half-bridge control circuitry for driving a power half-bridge in the electronic ballast; ballast control circuitry coupled to the half-bridge control circuitry and operable to provide signals to the half-bridge control circuitry to control operation of the half-bridge control circuitry; an input coupled to the ballast controlled circuitry and indicative of at least one of a state of power supplied to the electronic ballast and a state of an electronic ballast load, the ballast control circuitry controlling the half-bridge control circuitry based on the input; and power fractor control circuitry coupled to the ballast control circuitry and operable to regulate ballast power to obtain an improved power factor correction for the ballast, wherein the power factor control circuitry is selectively operable at a high gain to obtain a fast response or at a low gain for power factor correction optimization.