poe transformers document 445 specifications subject to change without notice. document 445 revised 11/24/04 for national semiconductor lm5070 poe interface inductance inductance leakage part at 0 a 1 at i pk 2 dcr max (ohms) 3 inductance turns ratio 5 i pk 2 number 10% (h) min (h) pri bias sec max (h) 4 pri : sec : bias (a) output C1495-A 127 114.3 0.255 0.310 0.018 1.25 1 : 0.166 : 0.5 1.0 3.3 v, 4.0 a c1585-a 127 114.3 0.222 0.348 0.039 0.950 1 : 0.25 : 0.5 1.0 5.0 v, 2.6 a c1586-a 127 114.3 0.199 0.308 0.129 0.650 1 : 0.5 : 0.5 1.0 12 v, 1.08 a 1. inductance measured at 250 khz, 0.2 vrms, 0 adc. 2. i pk is peak primary current drawn at minimum input voltage. 3. dcr for the secondary is per winding. 4. leakage inductance measured between pins 3 and 4 with all other pins shorted. these surface mount flyback transformers were devel- oped specifically for the national semiconductor lm5070 powered devices interface in 13 watt power over eth- ernet (poe) applications. they are designed to operate at 250 khz with an input voltage of 36 ? 72 volts. these industry-standard size ep13 transformers feature 1500 v rms isolation from the primary and bias windings to the secondary. coilcraft can also custom design transformers with voltage, inductance and dcr values to meet your spe- cific re quirements. for free evaluation samples, contact coilcraft or order them on-line at www.coilcraft.com. 4 1 3 2 10, 9 8, 7 bias pri sec 5. turns ratio is with the secondary windings connected in parallel. 6. operating temperature range ? 40c to +85c. 7. electrical specifications at 25c. 0.061 1,55 1 0.485 12,32 0.530 13,46 0.039 1,00 0.512 13,00 0.699 17,75 max 0.590 14,99 0.028 0,70 0.050 1,27 0.098 2,50 0.098 2,50 max max 10 1 6 5 recommended land pattern 0.004 /0,10 dot above pin1 tape and reel: 175/13 reel 32 mm tape width
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