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| Document 509 Flyback Transformer For National Semiconductor LM5071 & LM5072 PD Controllers * Dual-output flyback transformer for Power over Ethernet * Operates in continuous mode at 250 kHz with 14 -60 V input * 2000 Vrms isolation from primary and auxiliary to secondaries Core material Ferrite Terminations RoHS compliant tin-silver over tin over nickel over phos bronze. Other terminations available at additional cost. Weight 6.35g Ambient temperature -40C to +85C Storage temperature Component: -40C to +85C. Packaging: -40C to +80C Resistance to soldering heat Max three 40 second reflows at +260C, parts cooled to room temperature between cycles Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30C / 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: 32 mm wide, 0.5 mm thick, 28 mm pocket spacing, 12.93 mm pocket depth PCB washing Only pure water or alcohol recommended Part number1 DA2257-AL_ L at 0 A2 10% (H) 35.0 L at Ipk3 min (H) 30.0 DCR max (Ohms) 0.225 (aux) 0.138 (gate) 0.010 (sec 1) 0.018 (sec 2) 0.062 (pri) Leakage L4 max (H) 0.95 Turns ratios 2 : 1 (pri : aux) 3.6 : 1 (pri : gate) 6 : 1 (pri : sec1) 3.6 : 1 (pri : sec 2) Ipk3 (A) 2.7 Outputs 10 V, 0.05 A (aux) 5.5 V, 0.05 A (gate) 3.3 V, 2.0 A (sec 1) 5.0 V, 1.0 A (sec 2) 1. When ordering, please specify packaging code: DA2257-ALD Packaging: D = 13 machine-ready reel. EIA-481 embossed plastic tape (175 parts 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. Dot above pin1 2. Inductance is for the primary, measured at 250 kHz, 0.2 Vrms, 0 Adc. 3. Ipk is peak primary current drawn at minimum input voltage. 4. Leakage inductance is for the primary winding with all other pins shorted. 5. Electrical specifications at 25C. 9 5 Gate 8 Sec 1 7 10 Sec 2 6 Pri 4 0.004 /0,10 0.500 max 12,70 0.039 1,00 1 Aux 0.699 max 17,75 0.512 13,00 5 6 0.028 0,70 0.061 1,55 1 0.590 14,99 0.050 1,27 2 0.530 max 13,46 1 10 Recommended Land Pattern 0.098 2,50 0.098 2,50 Specifications subject to change without notice. Please check our website for latest information. Document 509 Revised 10/29/08 (c) Coilcraft, Inc. 2009 |
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