Document 608
Flyback Transformers
For Silicon Laboratories
Si3402 PD Controllers
•
Designed for Power over Ethernet PD controllers for applica-
tions up to 15 Watts.
•
Operates in continuous conduction mode with 36 – 57 V input
•
1500 Vrms, one minute isolation between primary and secondary
Core material
Ferrite
Terminations
RoHS tin-silver over tin over nickel over phos bronze.
Other terminations available at additional cost.
Weight
6.57 – 6.71 g
Ambient temperature
–40°C to +85°C
Storage temperature
Component: –40°C to +85°C.
Tape and reel 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: 32 mm wide, 0.5 mm thick,
28 mm pocket spacing, 12.93 mm pocket depth
PCB washing
Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf
Part
number
1
FA2924-AL_
FA2805-CL_
FA2925-AL_
Power
(W)
15
15
15
Inductance
at 0 A
2
±10% (µH)
40.0
40.0
40.0
Inductance
DCR max (Ohms)
4
at
Ipk
3
min (µH)
pri
sec
36.0
36.0
36.0
0.100
0.108
0.100
0.025
0.040
0.155
Leakage
inductance
5
Turns ratio
6
max (µH)
pri : sec
0.666
0.621
0.566
1 : 0.3
1 : 0.4
1:1
Ipk
3
(A)
2.0
2.0
2.0
Output
7
3.3 V, 4.5 A
5.0 V, 3.0 A
12.0 V, 1.25 A
1. When ordering, please specify
packaging
code:
FA2925-ALD
D
= 13″ machine-ready reel. 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 200 kHz, 0.2 Vrms, 0 Adc.
3.
Ipk
is peak primary current drawn at minimum input voltage.
4. DCR for the secondary is per winding.
5. Leakage inductance measured between pins 1 and 2 with all secondary pins shorted.
6. Turns ratio is with 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.
Packaging:
Dot above pin1
0.500 max
12,70
0.004 /0,10
0.699 max
17,75
0.512
13,00
1
0.039
1,00
2
Pri
1
7
8
Sec
10
9
0.080
2,03
0.590
14,99
0.050
1,27
0.028
0,70
10
Recommended
Land Pattern
1
0.530 max
13,46
0.098
2,50
5
Secondary windings to be con-
nected in parallel on PC board
6
Dimensions are in
inches
mm
0.098
2,50
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 608
Revised 03/14/12
© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
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