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Flyback Transformers
for TI LM5072 PD Interface

  • Developed for Texas Instruments LM5072 PD Interface for 24 Watt PoE applications
  • Specified by Texas Instruments for its POE+PHYTEREV-I/-E eval board
  • Five different outputs to match a variety of applications
  • 1500 Vrms isolation from primary and auxiliary to secondary
  • 18 – 57 V input voltage
  • 11 V, 20 mA auxiliary winding output
  • Coilcraft's DA2257-ALDA2383-AL and FA2519-AL are also specified for LM5072
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations.

SPECIFICATIONS


Part number1
Click for
samples
L at 0 A2
±10% (µH)
L at Ipk3
min  (µH)
DCR max (mOhms)4 Leakage
L max5
(µH)
Turns ratio6 Ipk3
(A)
Output7
pri sec aux pri : sec pri : aux
FA2677-AL_ 50 40.8 26 2.6 328 2.20 1 : 0.12 1 : 0.41 2.9 3.3 V, 7.5 A
FA2898-AL_ 50 40.8 26 4.0 315 1.05 1 : 0.18 1 : 0.41 2.9 5 V, 5 A
FA2899-AL_ 50 40.8 26 13 315 0.473 1 : 0.35 1 : 0.41 2.9 9 V, 2.8 A
FA2900-AL_ 50 40.8 26 20 315 0.409 1 : 0.47 1 : 0.41 2.9 12 V, 2.1 A
FA2901-AL_ 50 40.8 26 37 305 0.381 1 : 0.59 1 : 0.41 2.9 15 V, 1.7 A
1 When ordering, please specify packaging code: e.g. FA2677-ALD
Packaging: D = 13" reel, machine-ready 
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, 0.7 Vrms, 0 Adc
3 Ipk is peak primary current drawn at minimum input voltage.
4 DCR for the primary and the secondary is with the windings connected in parallel. DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
5 Leakage inductance measured on the primary windings with all secondary pins shorted.
6 Turns ratios are with the primary windings and secondary windings connected in parallel.
7 Output is with the secondary windings connected in parallel.
8 Ambient temperature range: −40°C to +125°C
9 Storage temperature range: Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
10 Resistance to soldering heat: Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
11 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

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Updated: March 22, 2017