Document 549 PoE Transformer For National Semiconductor LM5071 & LM5072 PD Controllers The FA2519-AL surface mount flyback transformer was developed specifically for National Semiconductor LM5071 and LM5072 Powered Devices Controllers in 13 Watt Power over Ethernet (PoE) applications. It is designed to operate at 250 kHz with a PoE input voltage of 36 – 72 Volts. It can also accept a 12 V input from auxiliary sources. Output with the secondary windings connected in parallel, is 3.3 V, 3.3 A. Output of the auxiliary winding is 10 V, 20 mA. Coilcraft can also design custom transformers with voltage, inductance and DCR values to meet your specific requirements. For free evaluation samples, contact Coilcraft or order them on-line at www.coilcraft.com. L at 0 A2 L at Ipk3 Part number1 ±10% (µH) ±10% (µH) FA2519-AL_ 55 40.2 DCR max (Ohms)4 Leakage L5 pri aux sec (µH) 0.0260.3880.0026 0.62 1. When ordering, please specify a packaging code: FA2519-ALD Packaging:D =13″ machine ready reel. EIA-481 embossed plastic tape (175 per full reel). B =Less than full reel. In tape, but not machine ready. To have a leader and trailer added ($25 charge), use code letter D instead. 2. Inductance is for the primary, measured at 250 kHz, 0.7 Vrms, 0 Adc. 3.Ipk is the peak current drawn at minimum input voltage. Ipk3 Isolation7 Turns ratio6 pri : sec pri : aux(A)(Vrms) 1 : 0.20 1 : 0.60 2.4 1500 4. DCR for the primary and for the secondary is with the windings connected in parallel. 5. Leakage inductance measured on the primary windings with all secondary pins shorted. 6. Turns ratio is with the primary windings and the secondary windings connected in parallel. 7. Isolation is from primary and auxiliary windings to secondary windings for one minute. 8. Operating temperature range –40°C to +125°C. 9. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 1 2 Pri 4 3 5 12 11 10 Sec 9 8 7 Aux 6 Primary windings and secondary windings to be connected in parallel on PC board. Dimensions are in inches mm Weight 13.5 g Terminations Tin-silver over tin over nickel over phos bronze Packaging 175 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick, 28 mm pocket spacing, 11.9 mm pocket depth US +1-847-639-6400 [email protected] UK +44-1236-730595 [email protected] Taiwan +886-2-2264 3646 [email protected] China +86-21-6218 8074 [email protected] Singapore + 65-6484 8412 [email protected] Document 549 Revised 09/12/11 © Coilcraft Inc. 2013 This product may not be used in medical or high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check web site for latest information.