Document 655 Flyback Transformer For National Semiconductor LM5015 Two-Switch DC-DC Regulator • Referenced on NSC application notes AN‑1724 and AN-1725 • Designed to operate at 250 kHz in continuous conduction mode with 36 – 72 Volts input • 1500 Vrms, one minute isolation from the primary and auxiliary to the secondary Core material Ferrite Terminations RoHS tin-silver over tin over nickel over phos bronze. Other terminations available at additional cost. Weight 6.0 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 Only pure water or alcohol recommended InductanceInductance Leakage 4 3 DCR max (Ohms) Turns ratio6 Part Power at 0 A2 at Ipk inductance5 1 number (W) ±10% (µH) min (µH) pri sec aux max (µH) pri : sec pri : aux GA3372-AL_ 13 102.0 91.8 0.1850.0175 0.270 1 : 0.251 : 0.50 0.780 Ipk3 (A) 1.2 5 V, 2.6 A Output7 1. When ordering, please specify packaging code: GA3372-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 measured at 250 kHz, 0.7 Vrms, 0 Adc. 3. Peak primary current drawn at minimum input voltage. 4. DCR for the secondary is with windings connected in parallel. 5. Leakage inductance is for the primary and is measured with the secondary shorted. 6. Turns ratio is with the secondary windings connected in parallel. 7. Output of the secondary is with the windings connected in parallel. Auxiliary winding output is 10 V, 20 mA. 8. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 1 Primary 2 4 10 9 Secondary 7 6 Auxiliary 5 Secondary windings to be connected in parallel on PC board 0.080 2,03 1 0.590 14,99 Dot above pin1 0.500 max 12,70 0.004 /0,10 0.039 1,00 0.699 max 17,75 0.050 1,27 0.512 13,00 6 5 Recommended Land Pattern 0.028 0,70 0.530 max 13,46 1 0.098 2,50 10 Dimensions are in 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] inches mm 0.098 2,50 Document 655 Revised 10/28/08 © Coilcraft Inc. 2012 This product may not be used in medical of high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check out web site for latest information.