Datasheet 3D Model

Forward Mode Transformer

for 25 Watt Applications

Developed for Texas Instruments TPS23754 PWM Controller
Designed for forward topology operating at 250 kHz

Buy Now:

Count	Unit price
1	$4.15
175	$3.54
700	$3.09
1400	$2.41
2800	$2.07
5000	$1.88

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

Termination

L = Tin-silver-copper over tin over nickel

Packaging

D = 13" machine-ready reel

. in stock, ready to ship today.

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Typical Application

Works with Texas Instruments TPS23754

Input Voltage	Output 1		Power	Fsw
Input Voltage	Sec	Bias	Power	Fsw
20 V — 57 V	5 V , 4.8 A	12 V , 0.02 A	25 W	250 kHz

Specifications

Electrical specifications at 25°C.

Part number (Hover for schematics)	Inductance min (µH) 2	DCR max 3			Leakage Inductance max (µH) 4	Turns Ratio 5	Isolation Voltage (Vrms) 6
Part number (Hover for schematics)	Inductance min (µH) 2	Pri (mΩ)	Sec (mΩ)	Bias (mΩ)	Leakage Inductance max (µH) 4	Pri : Sec : Bias	Isolation Voltage (Vrms) 6
WA8515-ALD	90	146	25	494	0.816	1 : 0.406 : 0.813	1500

Notes

Output is with the secondary windings connected in parallel. Bias winding output is 12 V, 20 mA.
Inductance measured at 250 kHz, 0.1 Vrms, 0 Adc.
DCR for the secondary is measured with the windings connected in parallel. For other operating temperatures, use this DCR at Temperature calculator.
Leakage inductance is for the primary and is measured with the secondary shorted.
Turns ratio is with the secondary windings connected in parallel.
1500 Vrms one minute isolation primary and bias to secondary.

Lead Length:

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

Termination:

RoHS tin-silver-copper over tin over nickel over phos bronze. Other terminations available at additional cost.

Packaging:

175 per 13″ reel. Plastic tape: 32 mm wide, 0.6 mm thick, 28 mm pocket spacing, 13.40 mm pocket depth.

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

Secondary windings to be connected
in parallel on 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	38,4	32,4	32	28	4	2	13,4	0,6

General specification

Core Material:

Ferrite

Weight:

6.7 g

Packaging:

175 per 13″ reel Plastic tape: 32 mm wide, 0.6 mm thick, 28 mm pocket spacing, 13.40 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 allowing parts to cool 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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Forward Mode Transformer

for 25 Watt Applications

Selected configuration not available

Typical Application

Specifications

Lead Length:

Termination:

Packaging:

Schematics

Physical characteristics

Tape and Reel specification

General specification

Soldering/Washing

Warning