Document 736 Flyback Transformer For Linear Technology LT3751 Capacitor Charger Controller • Flyback transformer for the Linear Technology LT3751 Capacitor Charger Controller • 5 – 24 V input; 5 V, 3.6 A and ±15 V, 1.2A outputs • 1500 Vrms, one minute isolation from primary to secondary windings 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 25.0 g Ambient temperature –40°C to +85°C Storage temperature Component: –40°C to +85°C. Tray 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 24 per tray PCB washing Tested with pure water or alcohol only. For other solvents, see Doc787_PCB_Washing.pdf. InductanceInductance Leakage Volt-time DCR max (Ohms)3inductance4 at 0 A1 at Ipk2 Part Turns ratio5 Ipk2 product number ±10% (µH) min (µH) pri sec 1 sec 2 sec 3 max (µH) pri : sec 1 : sec 2 : sec 3 (A) typ (V µsec) HA3994-AL 7.50 6.75 0.018 0.020 0.031 1. Inductance is measured at 100 kHz, 0.1 Vrms. 2. Peak primary current drawn at minimum input voltage. 3. DCR for the primary is with the windings connected in parallel. 4. Leakage inductance is for both windings of the primary with the secondary windings shorted. 0.031 0.22 1 : 0.5 : 1.5 : 1.5 5. Turns ratios are with the primary windings connected in parallel. 6. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. Dot indicates pin 1 1 12 HA3994-AL XXXXY 0.039 1,00 0.108 2,75 0.148 3,75 1.053 max 26,75 1.10 28,2 1 1 2 12 Recommended Land Pattern 0.148 3,75 5.0 37.5 Pri 5 – 24 V 11 12 4 Sec 1 5 V, 3.6 A 9 5 Sec 2 15 V, 1.2 A 8 6 0.079 2,00 Sec 3 –15 V, 1.2 A Parts manufactured prior to December 2011 may be marked differently. 7 Primary windings to be connected in parallel on PC board. 0.551 max 14,0 1.024 26,0 1.35 max 34,29 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 736 Revised 12/15/11 © 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.