DA2257-AL COILCRAFT | Alldatasheet
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© Coilcraft, Inc. 2009 Specifications subject to change without notice. Please check our website for latest information. Flyback Transformer Document 509 Document 509 Revised 10/29/08 For National Semiconductor LM5071 & LM5072 PD Controllers Part L at 0 A 2 L at Ipk3 DCR max Leakage L 4 Turns Ipk3 number1 ±10% (µH) min (µH) (Ohms) max (µH) ratios (A) Outputs 0.138 (gate) 3.6 : 1 (pri : gate) 5.5 V, 0.05 A (gate) 0.010 (sec 1) 6 : 1 (pri : sec1) 3.3 V, 2.0 A (sec 1) 0.018 (sec 2) 3.6 : 1 (pri : sec 2) 5.0 V, 1.0 A (sec 2) 0.062 (pri) 1. When ordering, please specify packaging code: DA2257-ALD Packaging: D =1 3″ 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. 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 25°C. 0.061 1,55 0.500 12,70 0.530 13,46 0.039 1,00 0.512 13,00 0.699 17,75max 0.590 14,99 0.028 0,70 0.050 1,27 0.098 2,50 0.098 2,50 max max Recommended Land Pattern 0.004 /0,10 Dot above pin1 Aux Pri Sec 1 Sec 2 Gate 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 –40°C to +85°C Storage temperature Component: –40°C to +85°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: 32 mm wide, 0.5 mm thick, 28 mm pocket spacing, 12.93 mm pocket depth PCB washing Only pure water or alcohol recommended 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