GENERAL DESCRIPTION

The ML4831 is a complete solution for a dimmable, high power factor, high efficiency electronic ballast. Contained in the ML4831 are controllers for “boost” type power factor correction as well as for a dimming ballast.

FEATURES

■ Complete Power Factor Correction and Dimming Ballast Control on 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 Over-Voltage comparator eliminates output “runaway” due to load removal

■ Large oscillator amplitude and gain modulator improves noise immunity