Document 826 Flyback Transformer For TI TPS23754 PoE Interface and DC/DC Converter • Flyback transformer developed for the TI TPS23754 PoE Interface and DC/DC Converter. • Designed for continuous operation to 250 kHz • Dual output: 5.25 V, 4 A and 12 V, 1 A; Input: 34 – 57 V • 1500 Vrms isolation primary and bias to secondary windings Core material Ferrite Terminations RoHS tin-silver over tin over nickel over phos bronze. Other terminations available at additional cost. Weight 12 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 175 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick, 32 mm pocket spacing, 11.9 mm pocket depth PCB washing Only pure water or alcohol recommended L at 0 A2 L at Ipk3 4 Turns ratio Part ±10%min DCR max (Ohms) Leakage L5 1 number (µH)(µH) prisec1 sec2 bias max (µH) pri : sec1pri : sec2pri : bias JA4302-AL_ 75 67.5 0.0750.00650.035 0.240 1. When ordering, please specify packaging code: JA4302-ALD 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, 0.1 Vrms. 1.95 Ipk3 1 : 0.1111 : 0.1481 : 0.259 Output5 (A) sec1; sec2 3.0 5.25 V, 4 A; 12 V, 1 A 3. Peak primary current drawn at minimum input voltage. 4. DCR for the primary and sec1 are each measured with windings connected in parallel 5. Leakage inductance is for the primary with all secondary windings shorted. 6. Bias winding output: 11.4 V, 15 mA 7. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 1 2 Primary 4 3 7 Sec2 8 10 9 5 Bias 6 Sec1 11 12 Primary windings and Sec1 windings each to be connected in parallel on the PC board. Pin 8 to be connected to pins 9 and 10 on the PC board. 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 826 Revised 09/01/11 © Coilcraft Inc. 2012 This product may not be used in medical or high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check out web site for latest information.