GENERAL DESCRIPTION

The ML4833 is a complete solution for a dimmable or a non-dimmable, high power factor, high efficiency electronic ballast. The BiCMOS ML4833 contains controllers for “boost” type power factor correction as well as for a dimming ballast. The ML4833 was designed to minimize the number of external components required to build an electronic ballast.

FEATURES

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

■ Low distortion, high efficiency continuous boost, peak 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

■ Internal over-temperature shutdown replaces external heat sensor

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

■ Low start-up current <0.5mA

■ Power reduction pin for end of life and GFI detectors