TL/CFL - Self-oscillating Ballast
Self-oscillating push-pull fluorescent lamp ballasts are widely replacing traditional magnetic ballasts especially since they can provide more efficient lamp control together with an increase in power factor. The self-oscillating push-pull topology can be applied efficiently with ST´s optimized power bipolar transistors. The following diagram proposes a wide range of the most useful products and devices applicable to high frequency ballast circuits.
AN2349: Simple cost-effective PFC using bipolar transistors for low-to-medium power HF ballasts
AN527: Electronic fluorescent lamp ballast