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 tosecondaryCore material Ferrite
Terminations RoHS tin-silver (96.5/3.5) over tin over nickel overphos 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)
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.		 L at 0 A2 L at Ipk3
DCR max (Ohms)4		
Turns ratio6 	 Part±10%min		
Leakage L5		
number1(µH)
(µH)
pri
sec
bias drive max (µH) pri : sec pri : bias pri : drive
MA5281-BL_45

40.50.060 0.058

0.370 0.323

0.550

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). Quantities less than full
reel available: in tape (not machine ready) or withleader and trailer ($25 charge).
B = Less than full reel. In an effort to simplify our partnumbering system, Coilcraft is eliminating the needfor multiple packaging codes. When ordering, simply
change the last letter of your part number from B to D.
Dot indicates pin 1
1MA5281-BL

0.118
3,00

12XXXXY

0.028
0,70

0.827
21,00.118
3,00

0.810 max
20,57
0.050
1,27
0.130
3,3

1 : 0.57

1 : 0.57

1 : 0.52

Ipk3(A)

Output7

2.8

12 V, 1.25 A

2. Inductance is measured at 250 kHz, 0.1 Vrms, 0 Adc.
3. Peak primary current drawn at minimum input voltage.
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 connected in parallel.
7. Output is with the secondary windings connected in parallel. Output of thedrive 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.

112Recommended
Land Pattern0.93023,62341211PriSec

6591018BiasDrive

27

Primary windings and secondary
windings to be connected in parallelon PC board

0.425 max
10,800.969
24,6
1.181 max
30,00

0.004 / 0,10

Dimensions are ininchesmm

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 04/26/22© Coilcraft Inc. 2022
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.