Document 452 SMT Power Transformer For Linear Technology LT1725 Isolated Flyback Controller • Can be used in isolated and non-isolated designs • Operates with 36 – 72 Volts input; can be used for PoE. • 1500 Vrms, one minute isolation between the primary and the secondary Core material Ferrite Terminations RoHS tin-silver (96.5/3.5) over tin over nickel over phos bronze. Other terminations available at additional cost. Weight 5.1 g 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 200 per 13″ reel Plastic tape: 44 mm wide, 0.35 mm thick, 28 mm pocket spacing, 9.6 mm pocket depth PCB washing Tested with pure water or alcohol only. For other solvents, see Doc787_PCB_Washing.pdf. Leakage Turns ratio DCR max (Ohms) L max5 Part L at 0 A2 L at Ipk3 Ipk3 1 4 number Power ±10% (µH) min (µH) pri sec bias (µH) pri : sec6 pri : bias(A) C1048-AL_ 13 W 94.0 84.6 0.210 0.01 1. When ordering, please specify packaging code: C1048-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, 0.3 Vrms, 0 Adc. 3. Peak primary current drawn at minimum input voltage. 1 Dot indicates pin 1 0.028 0,72 12 C1048-AL 0.677 max 17,20 3.9 Recommended Land Pattern 12 0.07 1,79 0.335 max 8,51 0.590 14,98 0.693 17.60 5 V, 2 A 10 9 2 0.098 2,5 Primary 4 Secondary 11 12 6 7 0.865 max 21,97 1 : 0.12 1 : 0.47 1.2 4. DCR is for both windings of the secondary connected in parallel. 5. Leakage inductance is for the primary winding with the secondary windings shorted. 6. Turns ratio is with the secondary windings connected in parallel. 7. Output is with the secondary windings connected in parallel. Output of the bias winding with a 15 V, 0.2 A. 8. Operating temperature range –40°C to +125°C. 9. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. XXXXY 6 0.079 2,01 1 0.098 2,5 0.453 Output7 0.135 3,43 0.665 16,88 Bias 1 Parts manufactured prior to December 2011 may be marked differently. Secondary windings to be connected in parallel on PC board 0.004 /0,10 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 452 Revised 12/21/11 © 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.