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© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft appr
oval.
Specification subject to change without notice.
Please check web site for latest infor
mation.
PoE Transformer
Document 549
Document 549 Revised 09/12/11
For National Semiconductor
LM5071 & LM5072 PD Controllers
1. When ordering, please specify a packaging code:
FA2519-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.
2. Inductance is for the primary, measured at 250 kHz, 0.7 Vrms, 0 Adc.
3. Ipk is the peak current drawn at minimum input voltage.
The FA2519-AL surface mount flyback transformer was
developed specifically for National Semiconductor LM5071
and LM5072 Powered Devices Controllers in 13 Watt
Power over Ethernet (PoE) applications.
It is designed to operate at 250 kHz with a PoE input volt-
age of 36 – 72 Volts. It can also accept a 12 V input from
auxiliary sources. Output with the secondary windings
connected in parallel, is 3.3 V, 3.3 A. Output of the auxiliary
winding is 10 V, 20 mA.
Coilcraft can also design custom transformers with volt-
age, inductance and DCR values to meet your specific
requirements.
For free evaluation samples, contact Coilcraft or order
them on-line at www.coilcraft.com.
6
5
Aux
Pri
Sec
12
9
8
7
10
11
1
3
4
2
4. DCR for the primary and for the secondary is with the windings con-
nected in parallel.
5. Leakage inductance measured on the primary windings with all second-
ary pins shorted.
6. Turns ratio is with the primary windings and the secondary windings
connected in parallel.
7. Isolation is from primary and auxiliary windings to secondary windings
for one minute.
8. Operating temperature range
–
40°C to +125°C.
9. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Weight 13.5 g
Terminations Tin-silver over tin over nickel over phos bronze
Packaging 175 per 13″ reel Plastic tape: 44 mm wide,
0.4 mm thick, 28 mm pocket spacing, 11.9 mm pocket depth
Part
L at 0 A
2
L at Ipk
3
DCR max (Ohms)
4
Leakage L
5
Turns ratio
6
Ipk
3
Isolation
7
number
1
±10% (µH) ±10% (µH) pri aux sec (µH) pri : sec pri : aux (A) (Vrms)
FA2519-AL_ 55 40.2 0.026 0.388 0.0026 0.62 1 : 0.20 1 : 0.60 2.4 1500
Primary windings and secondary
windings to be connected in parallel
on PC board.
Dimensions are in
inches
mm