3000 Watt Switching isolation Transformer

Designed for switching power applications, West Coast Magnetics' 408 series transformers can accommodate in excess of 2 kW of power. The ETD geometry is ideal for safety critical applications, as a high degree of creepage and clearance is built into the bobbin geometry. WCM stocks material suitable for switching frequencies up to 500 kHz.

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Design Constants

Size Code	A_l (ungapped, min.)	Ae core area (cm²)	le magnetic path length (cm)	Ve core volume (cm³)	Wa bobbin winding area (cm²)	WaAc core area x winding area (cm⁴)	Bobbin window width(cm)	Bobbin window height(cm)	Mean length per turn (cm)
ETD 54	3520	2.80	12.7	35.6	3.16	8.85	3.68	0.86	9.6
ETD 59	4200	3.68	13.9	51.2	3.67	13.51	4.12	0.89	10.6

Power Curve Assumptions:

Push/Pull circuit topology
Bobbin Window area utilization = 40%
Flux density (B) chosen so that core losses at all Frequencies are 70 mW/cm³.

output frequency

Output Power vs Frequency of Operation (Watts)

Size Code	25 kHz	50 kHz	100 kHz	250 kHz	500 kHz
ETD 54	680	900	1200	1650	2000
ETD 59	1000	1350	1800	2500	3000

schematics

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Size Code	L	W	H	l	d
ETD54	2.42/61.5	2.42/61.5	1.89/48.0	.178/4.5	.040/1.0
ETD59	2.61/66.2	2.63/66.9	1.99/50.5	.178/4.5	.040/1.0

Note: All materials of construction minimum Class B 130 degrees C rated.

Dimensions: Inches/mm

pcb layouts

click image to enlarge

Note 1:Holes to secure transformer. Recommended diameter = .134/3.4

Note: All materials of construction minimum Class B 130 degrees C rated.

Dimensions: Inches/mm

notes

Notes:

Reduce power rating in Table above by 50% for forward and flyback converter topologies.
Final sizing of the transformer will depend on a number of interrelated variables. The data in the above table should be considered a starting point only.
If safety agency is required, the final size may be significantly larger than the data in the table would indicate.