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| Document 672 Flyback Transformers * * * * For STMicroelectronics PM8800 PoE Powered Device Controller Flyback transformers developed for STMicroelectronics Operates at 250 kHz with 30 - 60 V input Versions for 5 V and 3.3 V output in 20 Watt applications 1500 Vrms isolation primary and bias to secondary windings Core material Ferrite Weight 8.3 - 8.5 g Terminations RoHS tin-silver over tin over nickel over phos bronze. Other terminations available at additional cost. Ambient temperature -40C to +125C Storage temperature Component: -40C to +125C. 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 200 per 13 reel Plastic tape: 44 mm wide, 0.4 mm thick, 24 mm pocket spacing, 11.5 mm pocket depth PCB washing Only pure water or alcohol recommended Part number1 FA2706-BL_ FA2707-BL_ L at 0 A2 10% (H) 77.8 77.8 L at Ipk3 min (H) 70.0 70.0 Leakage DCR max (Ohms)4 Turns ratio6 inductance5 pri sec drive aux max (H) pri: sec pri:drive pri:aux 0.155 0.008 0.215 0.382 1.53 6.80:1 4.25:1 2.43: 1 0.155 0.019 0.210 0.380 1.10 4.86:1 4.25:1 2.43: 1 Ipk3 (A) Output7 3.0 3.3 V, 6 A 3.0 5.0 V, 4 A 1. When ordering, please specify packaging code: FA2707-BLD Packaging: D = 13 machine ready reel. EIA-481 embossed plastic tape (200 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. 3. Peak primary current drawn at minimum input voltage. Dot indicates pin 1 1 4. DCR for the primary and the secondary is with windings connected in parallel. 5. Leakage inductance is for the primary, measured with the secondary and drive windings shorted. 6. Turns ratio is with the primary and the secondary windings connected in parallel. 7. Output of the secondary is with the windings connected in parallel. Aux winding output is 10 V; drive winding output is 5.5 V. 8. Electrical specifications at 25C. Refer to Doc 362 "Soldering Surface Mount Components" before soldering. 0.028 0,70 0.100 2,54 6 12 0.069 1,75 1 12 3 4 Pri 6 5 1 0.130 3,30 12 11 Sec 9 10 8 Drive FA270x-BL CCIXXXX 0.685 max 17,40 7 0.100 2,54 Recommended Land Pattern 0.699 17,00 0.748 19,0 Aux 2 7 0.425 max 10,80 0.004 / 0,10 Dimensions are in inches mm The primary and secondary windings are to be connected in parallel on the PC board. 0.799 20.30 0.950 max 24,13 Specifications subject to change without notice. Please check our website for latest information. Document 672 Revised 10/28/08 (c) Coilcraft, Inc. 2009 |
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