Document 458 Flyback Transformers For National Semiconductor LM5070 PoE Interface – 7 Watt • Flyback transformers for 7 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 3.85 g Ambient temperature –40°C to +85°C Storage temperature Component: –40°C to +85°C. Tape and reel 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 PCB washing Tested with pure water or alcohol only. For other solvents, see Doc787_PCB_Washing.pdf InductanceInductance Leakage 3 Turns ratio6 Ipk3 DCR max (Ohms)4inductance Part at 0 A2 at Ipk number1 ±10% (µH) min (µH) pri bias sec max (µH)5pri : secpri : bias(A) Output7 C1587-AL_ 155 139.5 0.414 0.822 0.036 4.00 1 : 0.191 : 0.667 0.65 3.3 V, 2.12 A C1588-AL_ 155 139.5 0.414 0.822 0.060 3.60 1 : 0.2621 : 0.667 0.65 5.0 V, 1.4 A C1589-AL_ 155 139.5 0.414 0.822 0.343 3.25 1 : 0.6671 : 0.667 0.65 12 V, 0.6 A 1. When ordering, please specify packaging code: C1589-ALD Packaging:D =13″ machine-ready reel. EIA-481 embossed plastic tape. 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 10 kHz, 0.1 Vrms, 0 Adc. 3.Ipk is peak primary current drawn at minimum input voltage. 4. DCR for the secondary is per winding. 5. 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 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 0.433 max 11,00 3 6 5 Pri 0.004 /0,10 0.041 1,05 4 0.600 max 15,24 0.413 10,50 1 0.024 0,60 8 Recommended Land Pattern 0.080 2,03 0.460 11,68 2 0.098 2,50 Dimensions are in inches mm 1 Secondary windings to be connected in parallel on the PC board 1 5 7 8 Bias 0.050 1,27 0.50 max 12,7 4 Sec 0.098 2,50 Packaging: C1587-AL 250 per 13″ reel Plastic tape: 32 mm wide, 0.5 mm thick, 20 mm pocket spacing, 11.2 mm pocket depth C1588 / C1589-AL 200 per 13″ reel Plastic tape: 32 mm wide, 0.5 mm thick, 24 mm pocket spacing, 11.2 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 458 Revised 04/01/13 © 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.