Document 592 Flyback Transformers • • • • For National Semiconductor LM5072 High Power PD Designed for 25 Watt PoE application Input range from 18 to 57 V Primary to secondary isolation: 1500 Vrms Auxiliary winding output: 11 V, 20 mA Core material Ferrite Terminations RoHS compliant tin-silver over tin over nickel over phos bronze. Other terminations available at additional cost. Weight 13.6 – 13.9 g Ambient temperature –40°C to +125°C Storage temperature Component: –40°C to +125°C. Packaging: –40°C to +80°C Resistance to soldering heat Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C / 85% relative humidity) Failures in Time (FIT) / Mean Time Between Failures (MTBF) 38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332 Packaging 175 per 13″ reel; Plastic tape: 44 mm wide, 0.4 mm thick, 32 mm pocket spacing, 11.9 mm pocket depth PCB washing Only pure water or alcohol recommended Part L at 0 A2 number1 ±10% (µH) FA2677-AL_ 50 FA2898-AL_ 50 FA2899-AL_ 50 FA2900-AL_ 50 FA2901-AL_ 50 L at Ipk3 min (µH) 40.8 40.8 40.8 40.8 40.8 DCR max (mOhms)4 pri sec aux 26 2.6 328 26 4.0 315 26 13 315 26 20 315 26 37 305 1. When ordering, please specify a packaging code: FA2898-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. Dot indicates pin 1 1 0.810 max 20,57 12 0.028 0,711 0.050 1,27 Recommended Land Pattern 7 1.181 max 30,00 Turns ratio6 pri : sec pri : aux 1 : 0.12 1 : 0.41 1 : 0.18 1 : 0.41 1 : 0.41 1 : 0.35 1 : 0.47 1 : 0.41 1 : 0.59 1 : 0.41 0.118 3,0 0.130 3,30 0.930 23,62 0.118 3,0 0.827 21,00 0.969 24,60 1 2 12 11 10 Pri Sec 4 3 5 7 8 9 Aux The primary windings and the secondary windings are to be connected in parallel on the PC board. 0.004 /0,10 Dimensions are in inches mm Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2009 Output7 3.3 V, 7.5 A 5 V, 5 A 9 V, 2.8 A 12 V, 2.1 A 15 V, 1.7 A 6 0.450 max 11,43 0.080 2,03 Ipk3 (A) 2.9 2.9 2.9 2.9 2.9 3. Ipk is the peak current drawn at minimum input voltage. 4. DCR for the primary and the secondary is with windings connected in parallel. 5. Leakage inductance measured on the primary windings with all secondary pins shorted. 6. Turns ratios are with the primary windings and the secondary windings connected in parallel. 7. Output is with the secondary windings connected in parallel. 8. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 1 FA2677-AL 6 Leakage L (µH)5 2.20 1.05 0.473 0.409 0.381 Document 592 Revised 10/29/08