Document 608 Flyback Transformers For Silicon Laboratories Si3402 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, one minute 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. 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 175 per 13″ reel Plastic tape: 32 mm wide, 0.5 mm thick, 28 mm pocket spacing, 12.93 mm pocket depth PCB washing Tested with pure water or alcohol only. For other solvents, see Doc787_PCB_Washing.pdf Inductance Part Power at 0 A2 number1 (W) ±10% (µH) FA2924-AL_ FA2805-CL_ FA2925-AL_ 15 15 15 Inductance DCR max (Ohms)4 at Ipk3 min (µH) pri sec 40.0 40.0 40.0 36.0 36.0 36.0 0.100 0.108 0.100 0.025 0.040 0.155 Leakage inductance5 Turns ratio6 max (µH) pri : sec 0.666 0.621 0.566 1 : 0.3 1 : 0.4 1:1 Ipk3 (A) Output7 2.0 2.0 2.0 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 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. Packaging: Dot above pin1 0.500 max 12,70 0.004 /0,10 0.039 1,00 2 7 8 Pri Sec 1 10 9 Secondary windings to be connected in parallel on PC board 0.080 2,03 0.590 14,99 0.050 1,27 Dimensions are in inches mm 0.512 13,00 1 Recommended Land Pattern 1 0.699 max 17,75 0.028 0,70 10 0.530 max 13,46 0.098 2,50 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] 5 6 Document 608 0.098 2,50 Revised 03/14/12 © 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.