Document 629 Flyback Transformer For Maxim MAX5941B PWM Controller • Flyback transformer for 13 W PoE applications • Designed to operate with 30 – 60 V input at 275 kHz • 1500 Vrms isolation from primary to secondary windings Core material Ferrite Terminations RoHS tin-silver over tin over nickel over phos bronze. Other terminations available at additional cost. Weight 5.5 g Ambient temperature –40°C to +125°C Storage temperature Component: –40°C to +125°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 200 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick, 28 mm pocket spacing, 9.6 mm pocket depth PCB washing Only pure water or alcohol recommended Inductance Inductance DCR max (Ohms)4 Part Power at 0 A2 at Ipk3 number1 (W) ±10% (µH) min (µH) pri sec bias GA3271-AL_ 13 117.5 104.0 0.201 0.06 0.335 Leakage Turns ratios6 inductance5 max (µH) pri :sec pri :bias 0.815 1 : 0.457 1 : 0.571 Ipk3 (A) Output7 1.0 12 V, 1.0 A 1. When ordering, please specify termination and packaging codes: GA3271-ALD Termination: L =RoHS tin-silver over tin over nickel over phos bronze. Special order: T = RoHS tin-silver-copper (95.5/4/0.5) or S = non-RoHS tin-lead (63/37). Packaging: D = 13″ machine-ready reel. EIA-481 embossed plastic tape (200 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, 0.1 Vrms. 3. Peak primary current drawn at minimum input voltage. 4. DCR for the primary and for the secondary are with the windings connected in parallel. 5. Leakage inductance is for the primary windings with the secondary windings shorted. 6. Turns ratios are with the primary the secondary windings connected in parallel. 7. Output of the secondary is with the windings connected in parallel. Bias winding output is 15 V, 20 mA. 8. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 1 2 Pri 11 12 Dot indicates pin 1 1 0.677 max 17,20 6 7 0.865 max 21,97 0.004 /0,10 0.135 3,43 1 0.665 16,88 0.079 2,01 0.693 17.60 Recommended Land Pattern Sec 10 GA3271-AL 0.340 max 8,64 8 7 6 5 12 0.098 2,5 12 0.590 14,98 0.028 0,72 6 7 1 12 Bias 3 Primary windings and secondary windings to be connected in parallel on PC board. 0.07 1,79 Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2009 Document 629 0.098 2,5 Revised 10/28/08