Document 824 Forward Mode Transformers For Texas Instruments TPS23756 PoE Interface • Developed for the TI TPS23756 High Power/High Efficiency PoE Interface and DC/DC Controller. • Designed for forward topology operating at 250 kHz with an extended input voltage range of 10 – 57 V. • 1500 Vrms, one minute isolation, primary and bias to secondary 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 12.1 – 13.1 g Ambient temperature –40°C to +125°C Storage temperature Component: –40°C to +125°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) / Failures in Time (FIT) 26,315,789 hours / 38 per billion hours, Calculated per Telcordia SR-322 Packaging 175 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick, 32 mm pocket spacing, 11.9 mm pocket depth PCB washing Tested with pure water or alcohol only. For other solvents, see Doc787_PCB_Washing.pdf. LeakageInput 3 Turns ratio6 Part Inductance2 DCR max (mOhms) inductance4 voltage5 number1 min (µH) pri sec bias max (µH) range (V) pri : sec pri : bias Output7 JA4249-CL_ JA4667-AL_ 90 90 0.0180 0.015 0.0175 0.047 0.320 0.320 0.120 0.085 1. When ordering, please specify a packaging code: JA4667-ALD 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 measured at 250 kHz, 0.2 Vrms, 0 Adc. Dot indicates pin 1 1 12 JA4XXX-XL XXXXY 0.028 0,70 0.118 3,00 0.118 3,00 0.810 max 20,57 10 – 57 10 – 57 12 Recommended Land Pattern 7 6 0.827 21,0 0.430 max 10,92 0.969 24,6 1.181 max 30,00 0.130 3,3 1 : 1.9 5 V, 5 A 1 : 1.9 12 V, 2 A 3. DCR for the secondary is measured with the windings connected in parallel. 4. Leakage inductance is for the primary and is measured with the secondary shorted. 5. Maximum duty cycle at minimum input voltage is 0.72. 6. Turns ratio is with the primary windings and secondary windings connected in parallel. 7. Output is with the secondary windings connected in parallel. Bias winding output is 12 V, 20 mA. 8. Electrical specifications at 25°C. Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 1 0.050 1,27 1 : 0.80 1 : 1.9 0.930 23,62 Parts manufactured prior to December 2011 may be marked differently. 7 8 1 2 Primary 4 3 Secondary 12 11 5 Bias 6 Primary windings and secondary windings to be connected in parallel on PC board. 0.004 / 0,10 Dimensions are in 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 824 Revised 12/16/11 © 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.