Document 592
For National Semiconductor
Flyback Transformers LM5072 High Power PD
• Designed for 25 Watt PoE application
• Input range from 18 to 57 V
• Primary to secondary isolation: 1500 Vrms
• Auxiliary winding output: 11 V, 20 mA
Core material Ferrite
Terminations RoHS compliant tin-silver over tin over nickel over
phos bronze. Other terminations available at additional cost.
Weight 13.6 – 13.9 g
Ambient temperature –40°C to +125°C
Storage temperature Component: –40°C to +125°C.
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)
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
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 Only pure water or alcohol recommended
DCR max (mOhms)4
Turnsratio6
pri:sec pri:aux
Part
L at 0 A2
L at Ipk3
Leakage
L (µH)5
Ipk3
(A)
number1
±10% (µH) min (µH)
pri
sec
aux
Output7
FA2677-AL_
FA2898-AL_
FA2899-AL_
FA2900-AL_
FA2901-AL_
50
50
50
50
50
40.8
40.8
40.8
40.8
40.8
26
26
26
26
26
2.6
4.0
13
20
37
328
315
315
315
305
2.20
1.05
0.473
0.409
0.381
1:0.12
1:0.18
1:0.35
1:0.47
1:0.59
1:0.41
1:0.41
1:0.41
1:0.41
1:0.41
2.9 3.3 V, 7.5 A
2.9 5 V, 5 A
2.9 9 V, 2.8 A
2.9 12 V, 2.1 A
2.9 15 V, 1.7 A
1. When ordering, please specify a packaging code:
FA2898-ALD
3. Ipk is the peak current drawn at minimum input voltage.
4. DCR for the primary and the secondary is with windings connected in
parallel.
5. Leakage inductance measured on the primary windings with all
secondary pins shorted.
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.
6. Turns ratios are with the primary windings and the secondary windings
connected in parallel.
7. Output is with the secondary windings connected in parallel.
8. Electrical specifications at 25°C.
2. Inductance is for the primary, measured at 250 kHz, 0.7 Vrms, 0 Adc.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Dot indicates pin 1
0.028
0,711
12
11
10
0.050
1,27
1
12
1
1
2
0.810
20,57
Recommended
Land Pattern
max
Pri
Sec
FA2677-AL
4
3
5
7
8
9
6
7
0.118
3,0
0.130
3,30
0.930
23,62
1.181
max
0.118
3,0
30,00
Aux
6
0.450
11,43
max
The primary windings and the secondary
windings are to be connected in parallel
on the PC board.
0.004/0,10
0.827
21,00
0.969
24,60
0.080
2,03
inches
mm
Dimensions are in
Specifications subject to change without notice.
Please check our website for latest information.
Document592 Revised10/29/08
© Coilcraft, Inc. 2009
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