ML4832 Datasheet - Micro Linear Corporation

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 <0.5mA