Document 1053
Flyback Transformer
For TI TPS23756
15 W PoE Converter
• Flyback for Texas Instruments TPS23756 Wide Input Range
15 W PoE Converter; shown on PMP6659 schematic and BOM
• Input: 10.8 – 57 V
• 1500 Vrms, one minute isolation from primary and bias to
secondary
Core material
Ferrite
Terminations
RoHS tin-silver (96.5/3.5) over tin over nickel over
phos bronze. Other terminations available at additional cost.
Weight
11.3 g
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
175 per 13″ reel Plastic tape: 44 mm wide,
0.4 mm thick, 28 mm pocket spacing, 11.9 mm pocket depth
PCB washing
Tested with pure water or alcohol only. For other solvents,
see Doc787_PCB_Washing.pdf.
Part
number
1
MA5281-BL_
L at 0 A
2
L at
Ipk
3
±10%
min
(µH)
(µH)
45
40.5
DCR max (Ohms)
4
Turns ratio
6
Leakage L
5
pri
sec
bias drive max (µH) pri : sec pri : bias pri : drive
0.060 0.058
0.370 0.323
0.550
1
:
0.57
1
:
0.57
1
:
0.52
Ipk
3
(A)
2.8
Output
7
12 V, 1.25 A
1. When ordering, please specify a
packaging
code:
MA5281-BLD
Packaging: 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 measured at 250 kHz, 0.1 Vrms, 0 Adc.
3. Peak primary current drawn at minimum input voltage.
Dot indicates pin 1
1
4. DCR for the primary and the secondary is measured with windings
connected in parallel.
5. Leakage inductance is for the primary, measured with the windings
connected in parallel and the secondary windings shorted.
6. Turns ratio is with the primary windings and secondary windings con-
nected in parallel.
7. Output is with the secondary windings connected in parallel. Output of the
drive winding is 11 V, 15 mA. Output of the bias winding is 11.5 V, 15 mA.
8. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
0.028
0,70
0.118
3,00
12
0.118
3,00
1
12
3
4
12
11
MA5281-BL
XXXXY
0.810 max
20,57
0.050
1,27
0.130
3,3
Recommended
Land Pattern
Pri
6
5
1
Sec
9
10
8
0.827
21,0
0.425 max
10,80
0.969
24,6
1.181 max
30,00
0.930
23,62
Bias
2
Drive
7
Primary windings and secondary
windings to be connected in parallel
on PC board
0.004 / 0,10
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 1053
Revised 05/01/13
© Coilcraft Inc. 2017
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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