Document 729 Flyback Transformer For Microsemi PoE PD Power Supply • Developed for use with Microsemi UC3844 Current Mode Controller and LX1752 Buck Regulator • 1500 Vrms, one minute isolation from primary, auxiliary and reset to secondary; 500 Vrms from primary and reset to auxiliary • Designed for 36 V – 57 V input; 200 kHz Core material Ferrite Terminations RoHS tin-silver over tin over nickel over phos bronze. Other terminations available at additional cost. Weight 6.7 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) Mean Time Between Failures (MTBF) 26,315,789 hours 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 Part L at 0 A2 L at Ipk3 Input number1 ±10% (µH) min (µH) voltage (V) HA3905-CL_ 27.0 24.3 37 –57 DCR max Leakage L4Turns Ipk3 (Ohms) max (µH) ratios (A) Outputs5 0.170 (pri) 1.9 3.75 : 1(pri : sec ) 1.2 5 V, 2.5 A (sec) 0.015 (sec) 1.36 : 1(pri : aux) 12 V, 20 mA (aux) 0.385 (aux) 1 : 1(pri : reset) 0.371 (reset) 1. When ordering, please specify packaging code: HA3905-CLD 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 is for the primary, measured at 250 kHz, 0.1 Vrms, 0 Adc. 3.Ipk is peak primary current drawn at minimum input voltage. 4. Leakage inductance measured on the primary winding with all secondary pins shorted. 5. Output of the seconday is with the windings connected in parallel. 6. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 5 Dot above pin1 10 9 Pri 0.500 max 12,70 Reset 4 0.004 /0,10 0.039 1,00 0.512 13,00 5 6 7 1 0.699 max 17,75 Aux 0.028 0,70 6 0.080 2,03 1 0.590 14,99 0.050 1,27 2 Secondary windings to be connected in parallel on the PC board Recommended Land Pattern 0.530 max 13,46 1 Dimensions are in Sec 3 10 0.098 2,50 0.098 2,50 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 729 Revised 08/13/09 © 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.