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| Document 459 Flyback Transformers For National Semiconductor LM5070 PoE Interface - 3 Watt * Flyback transformers for 3 W PoE applications * Designed to operate in continuous mode at 250 kHz with an input of 36 - 72 Vdc * 1500 Vrms isolation from primary and bias to secondary Core material Ferrite Terminations RoHS tin-silver over tin over nickel over phos bronze. Other terminations available at additional cost. Weight 2.05 g 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 350 per 13 reel Plastic tape: 32 mm wide, 0.42 mm thick, 20 mm pocket spacing, 9.16 mm pocket depth PCB washing Only pure water or alcohol recommended Inductance Part at 0 A2 1 number 10% (H) C1590-AL_ 310 C1591-AL_ 310 C1592-AL_ 310 Inductance at Ipk3 min (H) 279 279 279 DCR max (Ohms)4 pri bias sec 1.02 2.01 0.066 1.02 2.01 0.118 1.04 2.01 0.700 2. 3. 4. 5. Leakage inductance5 max (H) 4.75 4.50 4.25 Turns ratio6 pri : sec pri : bias 1 : 0.19 1 : 0.70 1 : 0.28 1 : 0.70 1 : 0.70 1 : 0.70 Ipk3 (A) Output7 0.3 3.3 V, 0.91 A 0.3 5.0 V, 0.6 A 0.3 12 V, 0.25 A 1. When ordering, please specify packaging code: C1592-ALD Packaging: D = 13 machine-ready reel. EIA-481 embossed plastic tape (350 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 Inductance is for the primary, measured at 10 kHz, 0.1 Vrms, 0 Adc. Ipk is peak primary current drawn at minimum input voltage. DCR for the secondary is per winding. Leakage inductance measured between pins 3 and 4 with all other pins shorted. 6. Turns ratio is with the secondary windings connected in parallel. 7. Output of the secondary is with the windings connected in parallel. Bias winding output is 12 V, 20 mA. 8. Electrical specifications at 25C. Refer to Doc 362 "Soldering Surface Mount Components" before soldering. 0.355 max 9,02 0.041 1,05 0.004 /0,10 0.520 max 13,21 0.339 8,60 1 8 3 0.028 0,70 6 5 Sec 7 8 Recommended Land Pattern 0.080 2,03 0.370 9,40 Pri 0.050 1,27 4 2 Bias 0.430 max 10,92 0.098 2,50 4 5 1 0.098 2,50 1 Secondary windings to be connected in parallel on the PC board Specifications subject to change without notice. Please check our website for latest information. Document 459 Revised 10/29/08 (c) Coilcraft, Inc. 2009 |
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