Document 376 SMT Power Transformer For Linear Technology LT1725 Flyback Controller The A9967-AL surface mount transformer works with with Linear Technology LT1725 Isolated Flyback Controller. It is ideal for use in telecommunications isolated converters and isolated power supplies, and can be used in PoE applications. For the LT1725, 48 V to 15 V converter, three windings are connected in series for the primary and two windings are connected in parallel for the secondary output of 15 V, 2 A. The remaining winding provides power to the chipset. This low-profile transformer is designed for an input voltage of 36 – 72 Volts. It features six 1-to-1 windings and 500 Vrms, one minute isolation between windings. Coilcraft can also custom engineer a transformer to meet your specific requirements. For free evaluation samples, contact Coilcraft or visit www.coilcraft.com. Part number1 Inductance Inductance Leakage at 0 A2 DCR max4inductance5 at Ipk3 ±10% (µH) min (µH) (Ohms) max (µH) A9967-AL_ 10.0 9.0 0.045 1. When ordering, please specify packaging code: A9967-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 per winding of the primary, measured at 100 kHz, 0.1 Vrms, 0 Adc. Inductance of the primary, with three windings connected in series is 90 µH. 1.148 max 29,15 1 0.810 max 20,57 12 Parts manufactured prior to December 2011 may be marked differently. A9967-AL XXXXY 6 7 0.450 max 11,43 0.084 2,13 0.004 /0,10 0.969 24,6 0.827 21,0 6 0.200 Dimensions are in Output6 2.3 15 V, 2 A Core material Ferrite Weight: 11.9 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 175 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick, 28 mm pocket spacing, 12.0 mm pocket depth PCB washing Tested with pure water or alcohol only. For other solvents, see Doc787_PCB_Washing.pdf. 3 0.028 7 0,72 12 inches mm (A) 3. Peak primary current (with three windings connected in series) drawn at minimum input voltage. Peak current per winding is 7.0 A. 4. DCR is per winding. 5. Leakage inductance is for one winding and is measured with all other windings shorted. 6. Output is with both windings of the secondary connected in parallel. 7. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 0.130 3,30 0.93 23,62 1 1/3 Primary 0.05 1,27 0.118 3,0 12 11 Secondary 10 4 2 1 1/3 Primary Recommended Land Pattern 1 Ipk3 0.118 3,0 9 5 6 1/3 Primary Bias 8 7 Primary windings to be connected in series on the PC board. Secondary winding to be connected in parallel on the PC board. 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 376 Revised 08/06/13 © 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.