GENERAL DESCRIPTION

The ML4832 is a complete solution for a dimmable/nondimmable, high power factor, high efficiency electronic ballast. The BiCMOS ML4832 contains controllers for “boost” type power factor correction as well as for a dimming ballast.

FEATURES

■ Complete power factor correction and dimming ballast control in one IC

■ Low distortion, high efficiency continuous boost, average current sensing PFC section

■ Programmable start scenario for rapid or instant start lamps

■ Lamp current feedback for dimming control

■ Variable frequency dimming and starting

■ Programmable restart for lamp out condition to reduce ballast heating

■ Over-temperature shutdown replaces external heat sensor for safety

■ PFC overvoltage comparator eliminates output “runaway” due to load removal

■ Large oscillator amplitude and gain modulator improves noise immunity

■ Low start-up current