Document 672
Flyback Transformers
For STMicroelectronics PM8800
PoE Powered Device Controller
• Flyback transformers developed for STMicroelectronics
• Operates at 250 kHz with 30 – 60 V input
• Versions for 5 V and 3.3 V output in 20 Watt applications
• 1500 Vrms, one minute isolation primary and bias to secondary
windings
Core material
Ferrite
Weight
8.3 – 8.5 g
Terminations
RoHS tin-silver over tin over nickel over phos bronze.
Other terminations available at additional cost.
Ambient temperature
–40°C to +125°C
Storage temperature
Component: –40°C to +125°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
200 per 13″ reel Plastic tape: 44 mm wide,
0.4 mm thick, 24 mm pocket spacing, 11.5 mm pocket depth
PCB washing
Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf
Part
number
1
FA2706-BL_
FA2707-BL_
L at 0 A
2
±10% (µH)
77.8
77.8
L at
Ipk
3
min (µH)
70.0
70.0
DCR max (Ohms)
4
pri
sec drive aux
0.155 0.008 0.215 0.382
0.155 0.019 0.210 0.380
Leakage
Turns ratio
6
inductance
5
max (µH)
pri :sec pri : drive pri : aux
1.53
1.10
6.80
:
1
4.86
:
1
4.25
:
1
4.25
:
1
2.43
:
1
2.43
:
1
Ipk
3
(A)
3.0
3.0
Output
7
3.3 V, 6 A
5.0 V, 4 A
1. When ordering, please specify
packaging
code:
FA2707-BLD
Packaging: D
= 13″ machine ready reel. EIA-481 embossed plastic
tape (200 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, 0.2 Vrms.
3. Peak primary current drawn at minimum input voltage.
Dot indicates pin 1
1
4. DCR for the primary and the secondary is with windings connected in
parallel.
5. Leakage inductance is for the primary, measured with the secondary
and drive windings shorted.
6. Turns ratio is with the primary and the secondary windings connected in
parallel.
7. Output of the secondary is with the windings connected in parallel.
Aux winding output is 10 V; drive winding output is 5.5 V.
8. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
0.028
0,70
0.100
2,54
6
12
0.069
1,75
0.100
2,54
1
12
3
4
Pri
6
5
1
0.130
3,30
12
11
Sec
9
10
8
Drive
FA270x-BL
XXXX Y
0.685 max
17,40
7
Recommended
Land Pattern
0.699
17,00
Parts manufactured prior
to November 2011 may
be marked differently.
0.748
19,0
Aux
2
7
0.425
max
10,80
0.004 / 0,10
The primary and secondary windings are to
be connected in parallel on the PC board.
0.799
20.30
0.950
max
24,13
Dimensions are in
inches
mm
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 672
Revised 11/29/11
© 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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