Document 529 Flyback Transformer The D1766-AL multiple-output transformer was developed for use with Linear Technology LTC4267 Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator. It is ideal for use in telecommunications isolated converters and isolated power supplies. This low-profile transformer is designed for an input volt- For Linear Technology LTC4267 PoE PD Interface age of 36 – 72 Volts. It features interleaved primary and secondary windings to minimize leakage inductance and 1500 Vrms 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. InductanceInductance Leakage Turns ratio at 0 Adc2 at Ipk3 Inductance4 Ipk3 Part DCR max 1 number ±10% (µH) min (µH) (Ohms) max (µH) pri : S1 pri : S2,S3 (A) D1766-AL_ 221 200 0.420 (pins 1 – 3) 5.1 9.6 : 1 24 : 1 1.5 0.013 (pins 8 – 5) 0.013 (pins 7 – 6) 0.015 (pins 10 – 9) 0.030 (pins 12 – 11) 1. When ordering, please specify packaging code: D1766-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. Dot indicates pin 1 1 Pri 12 D1766-AL 0.810 max 20,57 S3 11 10 2.5 V 3 S2 XXXXY 6 9 8,7 1.8 V 7 1.181 max 30,00 S1 5,6 GND Parts manufactured prior to December 2011 may be marked differently. The secondary windings are to be connected in series on the board by connecting pins 9, 8 and 7 together and pins 11 and 10 together. Outputs at pins 12, 11,10 and 8,7 are referenced to ground (pins 5,6). 0.450 max 11,43 0.084 2,13 0.004 /0,10 0.969 24,6 0.028 0,72 6 0.827 21,0 0.130 3,30 7 0.930 23,62 1 3.3 V, 0.5 A (S3) 2.5 V, 1.5 A (S2) 1.8 V, 2.5 A (S1) 2. Inductance is for the primary, measured at 200 kHz, 1.1 Vrms, 0 Adc. 3. Peak primary current drawn at minimum input voltage. 4. Leakage inductance is for the primary and is measured with secondary windings shorted. 5. All outputs are referenced to ground. 6. Operating temperature range –40°C to +125°C. 7. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 12 3.3 V 1 Outputs5 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 12.7 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) 38 per billion hours Mean Time Between Failures (MTBF) 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 Tested with pure water or alcohol only. For other solvents, see Doc787_PCB_Washing.pdf. 0.050 1,27 Recommended Land Pattern 0.118 3,0 1 12 Dimensions are in inches mm 0.118 3,0 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 529 Revised 12/22/11 © 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.