Document 608 Flyback Transformers For Silicon Laboratories Si3400 and Si3401 PD Controllers • Designed for Power over Ethernet PD controllers for applications up to 15 Watts. • Operates in continuous conduction mode with 36 – 57 V input • 1500 Vrms isolation between primary and secondary Core material Ferrite Terminations RoHS tin-silver over tin over nickel over phos bronze. Other terminations available at additional cost. Weight 6.57 – 6.71 g Ambient temperature –40°C to +85°C Storage temperature Component: –40°C to +85°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 175 per 13″ reel Plastic tape: 32 mm wide, 0.5 mm thick, 28 mm pocket spacing, 12.93 mm pocket depth PCB washing Only pure water or alcohol recommended Part Power number1 (W) FA2924-AL_ 15 FA2805-CL_ 15 FA2925-AL_ 15 Inductance at 0 A2 ±10% (µH) 40.0 40.0 40.0 Inductance at Ipk3 min (µH) 36.0 36.0 36.0 DCR max (Ohms)4 pri sec 0.100 0.025 0.108 0.040 0.100 0.155 Leakage inductance5 max (µH) 0.666 0.621 0.566 Turns ratio6 Ipk3 pri : sec (A) 13 : 4 2.0 5:2 2.0 1:1 2.0 Output7 3.3 V, 4.5 A 5.0 V, 3.0 A 12.0 V, 1.25 A 1. When ordering, please specify packaging code: FA2925-ALD Packaging: D = 13″ machine-ready reel. EIA-481 embossed plastic tape (175 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 200 kHz, 0.2 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 1 and 2 with all secondary pins shorted. 6. Turns ratio is with the secondary windings connected in parallel. 7. Output is with the secondary windings connected in parallel. 8. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. Dot above pin1 0.500 max 12,70 0.004 /0,10 0.039 1,00 2 7 8 Pri Sec 1 10 9 0.080 2,03 0.590 14,99 0.699 max 17,75 0.050 1,27 0.512 13,00 0.028 0,70 10 1 Secondary windings to be connected in parallel on PC board Recommended Land Pattern 0.098 2,50 1 Dimensions are in 0.530 max 13,46 6 0.098 2,50 inches mm Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2009 5 Document 608 Revised 10/29/08