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, one minute 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 –40°C to +125°C Storage temperature Component: –40°C to +125°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 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 Tested with pure water or alcohol only. For other solvents, see Doc787_PCB_Washing.pdf Leakage 4 Turns ratio6 L at 0 A2 L at Ipk3 inductance5 Ipk3 Part DCR max (Ohms) 1 number ±10% (µH) min (µH) pri sec drive aux max (µH) pri : secpri : drivepri : aux (A)Output7 FA2706-BL_ FA2707-BL_ 77.8 77.8 70.0 70.0 0.155 0.0080.2150.382 0.155 0.0190.2100.380 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. 1.53 1.10 6.80 : 14.25 : 12.43 : 1 3.03.3 V, 6 A 4.86 : 14.25 : 12.43 : 1 3.05.0 V, 4 A 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 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. Dot indicates pin 1 1 FA270x-BL 0.100 2,54 0.069 1,75 12 XXXX Y 0.028 0,70 0.685 max 17,40 0.100 2,54 1 3 4 12 Pri Recommended Land Pattern 0.699 17,00 0.748 19,0 Parts manufactured prior to November 2011 may be marked differently. Sec 6 5 1 7 6 12 11 0.130 3,30 9 10 8 Drive Aux 2 7 The primary and secondary windings are to be connected in parallel on the PC board. 0.425 max 10,80 0.799 20.30 0.950 max 24,13 0.004 / 0,10 Dimensions are in inches mm 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 672 Revised 11/29/11 © 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.