EP11 datasheet(14/46 Pages) POWERINT

14 / 46 page

EPR-00011 - 70 W Adapter

22-Jan-01

Page 14 of 46

Power Integrations Inc

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www: http://www.powerint.com

TRANSFORMER CONSTRUCTION:

1/2 Primary Winding

Start at pin 2. Wind 9 turns of 2 parallel strands of item [3]

from left to right. Wind a single layer and finish at pin 1.

Shield Band (*see diagram)

Prepare cuffed foil [5]. Start at unterminated end of foil and

wind one (1) complete turn of foil around bobbin. Terminate

at pin 1 and cover with tape [8].

Secondary Winding

Attach Tri-filar item [4] to pin 12. Attach Tri-filar item [4] to

pin 11. Interleaving windings, wind across the bobbin.

From pin 12, wind 3 turns and finish at pin 9. From pin

11,wind 3 turns and finish at pin 8.

Foil Band (*see diagram)

Prepare cuffed foil [5]. Start at pin 6 and wind 2 complete

turns of foil around bobbin and terminate at pin 5.

Basic Insulation

1 layer of tape [8] for insulation.

1/2 Primary Winding

Start at pin 3. Wind 9 turns of 2 parallel strands of item [3]

from left to right. Wind a single layer and finish at pin 2.

Basic Insulation

1 layer of tape [8] for insulation.

Core

Affix center gapped core to bobbin.

Final Assembly and Core Contact

Wrap core with copper foil tape [6] Attach wire to pin 1 and

to copper tape.

Apply Tape to outside of Core

Wrap one layer of tape [10] around core. (see figure above)

Impregnation

Varnish Impregnate using [9]

6.1

Transformer Sources

For information on the vendors used to source the transformer, please visit our website at

the address below and select Engineering Prototype Boards

http://www.powerint.com/componentsuppliers.htm

Due to proximity of

secondary components

(R4, R13), wrap one

layer of tape [10] around

core.

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