Coilcraft, Inc. TA7818-AL flyback transformer for Microsemi PD70211 PD Controller TA7818-AL

TA7818-AL is a flyback transformer designed for 51 W PoE++ IEEE 802.3at-2009 applications using the Microsemi PD70211 PD controller, with a 12 V, 4.25 A output and 36-57 V input at 250 kHz. It features a 13 V, 30 mA auxiliary winding, 1500 Vrms isolation between primary and secondary, and 500 Vrms isolation between primary and auxiliary. The transformer has a primary inductance of 24.0 µH ±10% at 0 A, a maximum DCR of 0.024 Ω on the primary, 0.008 Ω on the secondary, and 0.13 Ω on the auxiliary, with 0.3 µH leakage inductance. Turns ratios are 1:0.5 for primary to secondary and 1:0.6 for primary to auxiliary. It is packaged in a tray of 24 units, weighs 25.4 g, operates from -40°C to +125°C ambient, and is RoHS compliant and halogen free. Terminations are tin-silver-copper over tin over nickel over phosphor bronze.