AN993 Datasheet, PDF (1/27 Pages) STMicroelectronics – Electronic ballast with PFC using L6574 and L6561

AN993
Application note
Electronic ballast with PFC using L6574 and L6561
Introduction
Dedicated ICs for lamp ballast applications are now replacing the old solutions based on
bipolar transistors driven by a saturable pulse transformer.
The L6574 is a high-performance ballast driver, designed using 600-V BCD offline
technology, which ensures all the features needed to properly drive and control a fluorescent
bulb. It is provided with built-in VCO start-up sequence circuitry, protections, and an
operation amplifier for implementing a closed-loop control of the lamp current.
July 2009
Doc ID 5656 Rev 10
1/27
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