Document 708 Flyback Transformer • • • • For Maxim Off-Line LED Driver Designed for PWM Dimming of High-Brightness LEDs Bias winding output: 18 V, 20 mA 400 V input; 110 V, 0.4 A output 1500 Vrms primary and bias to secondary isolation Core material Ferrite Terminations RoHS tin-silver over tin over nickel over phos bronze. Other terminations available at additional cost. Weight 21.3 g Ambient temperature –40°C to +125°C Storage temperature Component: –40°C to +125°C. 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 parts per tray PCB washing Only pure water or alcohol recommended Part number Inductance at 0 Adc1 ±10% (µH) Inductance at Ipk2 min (µH) GA3502-BL 800 720 Leakage Inductance3 max (µH) DCR max (Ohms) 1.283 (pins 1 – 3) 0.146 (pins 5 – 6) 0.361 (pins 12 – 7) 6.60 1. Inductance is for the primary (pins 1 – 3), measured at 250 kHz, 0.3 Vrms. 2. Peak primary current drawn at minimum input voltage. 3. Leakage inductance is for the primary winding (pins 1 – 3) with the secondary winding shorted. 4. Output is for the secondary. Bias winding output is 18 V, 20 mA. 5. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. Turns ratio pri : sec pri : bias Ipk2 (A) Output4 1 : 0.035 0.75 110 V, 0.4 A 1 : 0.06 Dot indicates pin 1 0.551 max 14,0 0.004 / 0,10 mm 1.169 29,7 1.285 max 32,65 1 12 Sec Pri 2 7 0.108 2,75 1.10 28,0 0.079 2,0 12 6 Recommended Land Pattern 1.053 max 26,75 6 7 Bias 6 7 1 3 5 Dimensions are in 0.157 4,0 inches mm These parts are preproduction products for electrical evaluation only. Specification subject to change without notice. © Coilcraft, Inc. 2009 0.043 1,1 1.024 26,0 1 12 0.657 16,7 Document 708 0.157 4,0 Revised 10/28/08