3D Model Datasheet

TA7818-AL flyback transformer

for Microsemi PD70211 PD Controller

Selected for the Microsemi PD70211EVB51F-12 evaluation board.
Designed for 51 W PoE++ IEEE 802.3at-2009 applications.

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Count	Unit price
1	$5.06
240	$4.35
480	$3.78
1200	$3.29
2400	$2.82
4800	$2.58

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Typical Application

Works with Microsemi PD70211

Input Voltage	Output 1		Power	Fsw
Input Voltage	Sec	Aux	Power	Fsw
36 V — 57 V	12 V , 4.25 A	13 V , 0.03 A	51 W	10 kHz

Specifications

Electrical specifications at 25°C.

Part number (Hover for schematics)	Inductance at 0A (µH) 2 (Tolerance: ±10%)	Inductance min at 5 A (µH)	DCR max (Ω) 3			Leakage Inductance max (µH) 4	Turns Ratio 5	Isolation Voltage (Vrms) 6
Part number (Hover for schematics)	Inductance at 0A (µH) 2 (Tolerance: ±10%)	Inductance min at 5 A (µH)	Pri	Sec	Aux	Leakage Inductance max (µH) 4	Pri : Sec : Aux	Isolation Voltage (Vrms) 6
TA7818-AL	24.0	22.0	0.024	0.008	0.130	0.3	1 : 0.5 : 0.6	1500

Notes

Output is with the secondary windings connected in parallel. Output of the auxiliary winding is 13 V, 30 mA
Inductance is for the primary, measured at 10 kHz, 0.1 Vrms, 0 Adc.
DCR is with the windings connected in parallel.
Leakage inductance is for the primary winding, measured with all other pins shorted.
Turns ratio is with primary windings connected in parallel and secondary windings connected in parallel.
1500 Vrms isolation, one minute pri to sec; 500 Vrms pri to aux; 1000 Vrms all windings to the core.

Termination:

RoHS-compliant 260°C compatible. Tin-silver-copper over tin over nickel over phos bronze.

Environmental

Environmental:

RoHS compliant

Ambient temperature range:

–40°C to +125°C

Storage temperature range:

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

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

See FIT/MTBF Calculations

Schematics

The primary windings and the secondarty
windings to be connected in parallel on
the PC board.

Physical characteristics

General specification

Core Material:

Ferrite

Weight:

25.4 g

Packaging:

24 parts per tray

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 to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

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