3D Model Datasheet

MA5281 Flyback Transformer

for TI TPS23756 15 W PoE Converter

Flyback for Texas Instruments TPS23756 High Power/High Efficiency PoE Interface and DC/DC Controller

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Count	Unit price
1	$5.09
100	$4.36
250	$3.80
500	$3.31
1000	$2.57
2500	$2.21
5000	$2.03

For high volume or non-stock items, request a quote.

Packaging

D = 13" machine-ready reel

. in stock, ready to ship today.

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Typical Application

Works with Texas Instruments TPS23756

Input Voltage	Output 1		Power	Fsw
Input Voltage	Sec	Bias	Power	Fsw
10 V — 57 V	12 V , 1.25 A	11.5 V , 0.02 A	15 W	250 kHz

Specifications

Electrical specifications at 25°C.

Part number 2 (Hover for schematics)	Inductance at 0A (µH) 3 (Tolerance: ±10%)	Inductance min at 2.8 A (µH)	DCR max (Ω) 4				Leakage Inductance max (µH) 5	Turns Ratio 6	Isolation Voltage (Vrms) 7
Part number 2 (Hover for schematics)	Inductance at 0A (µH) 3 (Tolerance: ±10%)	Inductance min at 2.8 A (µH)	Pri	Sec	Drive	Bias	Leakage Inductance max (µH) 5	Pri : Sec : Drive : Bias	Isolation Voltage (Vrms) 7
MA5281-BL_	45.0	40.5	0.060	0.058	0.323	0.370	0.550	1 : 0.57 : 0.52 : 0.57	1500

Notes

Output of the secondary is with the windings connected in parallel. Aux winding output is 2.5 V, 20 mA.
When ordering, please specify packaging code: e.g. MA5281-BLD
Inductance is for the primary, measured at 250 kHz, 0.1 Vrms, 0 Adc.
DCR for the primary and the secondary is measured with the windings connected in parallel. DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
Leakage inductance is for the primary, measured with the windings connected in parallel with the secondary windings shorted.
Turns ratios are with the primary windings and the secondary windings connected in parallel.
1500 Vrms, one minute isolation from primary and bias to secondary windings.

Termination:

RoHS-compliant. 260°C compatible. Tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations. Other terminations available at additional cost.

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 with leader and trailer ($25 charge).
B = Less than full reel. In an effort to simplify our part numbering system, Coilcraft is eliminating the need for multiple packaging codes. When ordering, simply change the last letter of your part number from B to D.

Environmental

Environmental:

RoHS compliant

Ambient temperature range:

–40°C to +85°C

Storage temperature range:

Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C

Maximum part temperature:

+125°C (Ambient + temperature rise)

Failures in Time (FIT) / Mean Time Between Failures (MTBF):

See FIT/MTBF Calculations

Schematics

Primary windings and secondary windings
to be connected in parallel on the PC board.

Physical characteristics

Tape and Reel specification

Parts per reel	Reel dimensions (mm)					Tape dimensions (mm)						Orientation
13" (330 mm)	A	B	C	D	E	W	P	Po	P1	H	T
175	330	100	13	50,4	44,4	44	28	4	2	11,9	0,4

General specification

Core Material:

Ferrite

Weight:

11.3 g

Packaging:

175 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick, 28 mm pocket spacing, 11.9 mm pocket depth

Soldering/Washing

Moisture Sensitivity Level (MSL):

1 (unlimited floor life at <30°C / 85% relative humidity)

Resistance to soldering heat:

Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles

Refer to Soldering Coilcraft Components before soldering.

PCB Washing:

Tested with pure water or alcohol only. More info.

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MA5281 Flyback Transformer

for TI TPS23756 15 W PoE Converter

Selected configuration not available

Typical Application

Specifications

Termination:

Packaging:

Schematics

Physical characteristics

Tape and Reel specification

General specification

Soldering/Washing

Warning