GENERAL DESCRIPTION

The ML4835 is a complete solution for a dimmable or a non-dimmable, high power factor, high efficiency electronic ballast especially tailored for a compact fluorescent lamp (CFL). The Bi-CMOS ML4835 contains controllers for “boost” type power factor correction as well as for a dimming ballast with end-of-lamp life detection.

FEATURES

■ Power detect for end-of-lamp-life detection

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

■ Leading- and trailing-edge synchronization between PFC and ballast

■ One to one frequency operation between PFC and ballast

■ Programmable start scenario for rapid/instant start lamps

■ Triple frequency control network for dimming or starting to handle various lamp sizes

■ Programmable restart for lamp out condition to reduce ballast heating.

■ Internal over-temperature shutdown

■ PFC over-voltage comparator eliminates output “runaway” due to load removal

■ Low start-up current;