Document 549
PoE Transformer
For National Semiconductor
LM5071 & LM5072 PD Controllers
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
voltage of 36 – 72 Volts. It can also accept a 12 V input
from auxiliary sources. Output with the secondary wind-
ings 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
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
number
1
FA2519-AL_
L at 0 A
2
±10% (µH)
55
L at
Ipk
3
±10% (µH)
40.2
DCR max (Ohms)
4
pri
aux sec
0.026 0.388 0.0026
Leakage
L (µH)
5
0.62
Turns ratio
6
pri : sec pri : aux
1
:
0.20
1
:
0.60
Ipk
3
(A)
2.4
Isolation
7
(Vrms)
1500
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.
4. DCR for the primary and for the secondary is with the windings
connected in parallel.
5. Leakage inductance measured on the primary windings with all
secondary 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.
8. Operating temperature range –40°C to +125°C.
9. Electrical specifications at 25°C.
Dot indicates pin 1
1
12
0.028
0,711
0.130
3,30
1
0.930
23,62
0.050
1,27
1
2
12
11
10
Pri
0.810 max
20,57
6
Sec
9
8
7
FA2519-AL
7
Recommended
Land Pattern
0.118
3,0
0.118
3,0
4
3
5
Aux
6
1.181 max
30,00
0.450 max
11,43
0.080
2,03
0.827
21,00
0.969
24,60
Primary windings and secondary
windings to be connected in parallel
on PC board.
0.004 /0,10
Weight:
13.5 g
Terminations:
Tin-silver over tin over nickel over phos bronze
Tape and reel:
175/13″ reel, 44 mm tape width
For packaging data see Tape and Reel Specifications section.
Specifications subject to change without notice.
Please check our website for latest information.
Document 549
Revised 09/11/06
© Coilcraft, Inc. 2008
Mobile and portable
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