Document 539 Flyback Transformer ForTIUCC28600 Flyback Green Mode Controller The FA2443-AL was developed specifically for Texas Instruments UCC28600 Quasi-Resonant Flyback Green Mode Controller and is specified in SLUU256A for the evaluation module. This transformers is designed to operate in discontinous conduction mode at frequencies up to 140 kHz. Inductance Inductance Part at 0 A1 at Ipk2 DCR max number ±10% (µH) min (µH) (Ohms) Leakage inductance3 Turns ratio .