Document 544 PoE Transformers For ST Microelectronics STE12PS PSE Power Controller These surface mount flyback transformers were developed specifically for the ST Microelectronics STE12PS 12-Channel PSE Power Control Device. They are designed to work with a 3.3 V input to provide a 12 V output. Isolation is 500 Vdc from each primary winding to the secondary winding. Coilcraft can also design custom transformers with voltage, inductance and DCR values to meet your specific requirements. For free evaluation samples, contact Coilcraft or order them on-line at www.coilcraft.com. Part L at 0 A2 number1 ±10% (µH) DA2420-AL_ 330 DA2421-AL_ 330 at Ipk3 DCR max (Ohms) min (µH) 1-5 2-6 12-7 297 0.756 0.886 5.920 297 0.803 0.984 14.145 L 1. When ordering, please specify a packaging code: DA2420-ALD Packaging:D =13″ machine ready reel. EIA-481 embossed plastic tape (175 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. Dot indicates pin 1 12 1 0.028 0,711 0.130 3,30 Leakage L Turns ratio5 Ipk3 (µH)4pri : sec(A) Output 6.00 1 : 2 2.0 12 V, 100 mA 4.83 1 : 3 2.0 12 V, 100 mA max 2. Inductance is for the primary, measured at 100 kHz, 0.1 Vrms, 0 Adc. 3.Ipk is the peak current drawn at minimum input voltage. 4. Leakage inductance measured on the primary windings with all secondary pins shorted. 5. Turns ratio is with the primary windings connected in parallel. 6. Operating temperature range –40°C to +125°C. 7. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 0.930 23,62 1 0.050 1,27 DA242x-AL 0.810 max 20,57 6 7 1.181 max 30,00 0.118 3,0 Pri 12 Sec 6 5 Recommended Land Pattern XXXX Y 1 2 0.118 3,00 7 Primary windings to be connected in parallel on the PC board. 0.450 max 11,43 0.080 2,03 0.827 21,00 0.969 24,60 0.004 /0,10 Weight 14.1 – 14.6 g Terminations Tin-silver over tin over nickel over phos bronze Tape and reel 175 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick, 32 mm pocket spacing, 11.p mm pocket depth 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 544 Revised 12/14/11 © 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.