Document 722 Flyback Transformers For Linear Technology LT3751 Capacitor Charger Controller • Flyback transformer for the Linear Technology LT3751 Capacitor Charger Controller for charging capacitors to 500 V • GA3459-BL: 5 – 24 V input; GA3460-BL: 12 – 24 V input • 1500 Vrms, one minute isolation from primary to secondary windings • Flux shield minimizes EMI emission 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 24.2 – 27.5 g Ambient temperature –40°C to +125°C Storage temperature Component: –40°C to +125°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. Part number InductanceInductance Leakage DCR max (mOhms)3inductance4 at 0 A1 at Ipk2 Turns ratio5 Ipk2 ±10% (µH) min (µH) pri sec max (µH) pri : sec (A) GA3459-BL GA3460-BL 5.0 2.5 4.25 2.25 7.70 5.63 515 400 1. Inductance is measured at 50 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 the primary with windings connected in parallel and with the secondary winding shorted. 0.10 0.06 GA3459-BL 1 2 3 4 12 12 1.024 1.285 max 26,0 32,65 Recommended Land Pattern 1.10 28,2 0.039 1,00 0.157 4,00 0.108 2,75 0.079 2,00 GA34xx-BL Internal code XXXX Y 0.551max 14,0 0.004 / 0,10 Dimensions are in inches mm 0.157 4,00 Flux shield 6 Pri Sec 9 10 11 12 7 1 2 3 4 1 1 20 50 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. 1.053 max 26,75 Dot indicates pin 1 1 : 10 1 : 10 GA3460-BL Flux shield 6 Pri Sec 12 11 10 9 7 Primary windings to be connected in parallel on PC board. Connect pin 6 to ground. Note: The primary windings of these transformers DO NOT have the same pinouts. Document 722 Revised 05/15/15