Document 1295 Flyback Transformer For Texas Instruments PMP7899 Reference Design • Developed for Texas Instruments PMP7899 Reference Design for Non-Synchronous Flyback Converter with an Isolated Output • 8 – 18 V input; 48 V, 1 A output • Aux winding output 9 V, 20 mA • 1500 Vrms, one minute primary and aux to secondary isolation (hipot) 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 25.9 g Ambient temperature –40°C to +125°C Maximum part temperature +125°C (ambient + temp rise) 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 parts per tray PCB washing Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. See Doc787_PCB_Washing.pdf. Inductance Inductance Leakage at 0 Adc1 at Ipk2 Inductance3 Turns ratio Part DCR max number ±15% (µH) min (µH) (Ohms) max (µH) pri : sec pri : aux NA6264-AL 2.56 2.176 0.0065 (pins 1 – 3)0.060 0.0065 (pins 2 – 4) 0.130 (pins 5 – 6) 0.110 (pins 11-8) 1. Inductance is for the primary with windings connected in parallel, measured at 300 kHz, 0.3 Vrms. 2. Peak primary current drawn at minimum input voltage. 3. Leakage inductance is for the primary with the windings connected in parallel and with the secondary winding shorted. 4. Output is for the secondary. Aux winding output is 9 V, 20 mA. 5. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 1 2 Pri 4 3 11 Sec 0.108 2,75 1.10 28,0 1 8 6 (A) Output4 16.5 48 V, 1 A Dot indicates pin 1 0.551 max 14,0 0.004 / 0,10 mm 1.116 28,1 1.30 max 33,02 0.079 2,0 12 0.039 1,0 1.024 26,0 7 6 Recommended Land Pattern 5 Aux 1 : 61 : 1.5 Ipk2 1.053 max 26,75 6 7 0.148 3,75 Primary windings to be connected on the PC board. 1 12 0.657 16,7 0.148 3,75 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 Document 1295 Revised 08/07/15 © Coilcraft Inc. 2016 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.