FA2677-AL Datasheet, PDF (1/1 Pages) Coilcraft lnc. – Flyback Transformers

Document 592
Flyback Transformers ForNationalSemiconductor
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
Part
number¹
FA2677-AL_
FA2898-AL_
FA2899-AL_
FA2900-AL_
FA2901-AL_
L at 0 A²
±10% (µH)
50
50
50
50
50
L at Ipk³
min (µH)
40.8
40.8
40.8
40.8
40.8
DCR max (mOhms)⁴
pri
sec aux
26
2.6 328
26
4.0 315
26
13
315
26
20
315
26
37
305
Leakage
L (µH)⁵
2.20
1.05
0.473
0.409
0.381
Turns ratio⁶
pri : sec pri : aux
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
Ipk³
(A)
Output⁷
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
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 the secondary is with windings connected in
parallel.
5. Leakage inductance measured on the primary windings with all
secondary pins shorted.
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.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Dot indicates pin 1
0.028
0,711
0.050
12
1
12
1
1,27
1
11
2
10
0.810 _max
20,57
FA2677-AL
Recommended
Land Pattern
Pri
Sec
4
7
6
7
0.118
1.181 _max
3,0
0.130
3,30
0.930
23,62
3
0.118
5
8
9
30,00
3,0
Aux
0.450 _max
11,43
0.080
2,03
0.827
21,00
0.969
24,60
0.004 /0,10
Dimensions are in
inches
mm
Specifications subject to change without notice.
Please check our website for latest information.
6
The primary windings and the secondary
windings are to be connected in parallel
on the PC board.
Document 592 Revised 10/29/08
© Coilcraft, Inc. 2009