TOP245P datasheet(11/25 Pages) POWERINT

11 / 25 page

DER-19

TOP245P Multiple Output Set Top Box

March 30, 2004

Page 11 of 25

Power Integrations, Inc.

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

www.powerint.com

7.4

Transformer Build Diagram

Figure 5 – Transformer Build Diagram

7.5

Transformer Construction

Bobbin Preparation

Place 3mm of Margin tape on each side of the EF30 Bobbin

½ Primary

Start at Pin 4. Wind 36 turns of item [3] in approximately 1 layer. Bring

finish lead back to start. Finish on Pin 2.

Basic Insulation

Use two layers of item [5] for basic insulation.

Bifilar Bias Winding

Starting at Pin 6, wind 9 bifilar turns of item [3]. Spread turns evenly

across bobbin. Finish at Pin 3.

Insulation

Use three layers of item [5] for safety insulation.

3V3 and 5V

Windings

Start at Pins 7 and 8. Wind 2 turns of copper foil [4]. Bring termination

wire out onto pin 9. Continue with one further copper foil turn and finish

with termination on pin 10.

12V and 20V

Windings

Start at Pin 10. Wind 4 turns of 4 parallel strands of item [7] using half the

bobbin width. Terminate on pin 11. Continue with 4 further turns of 4

parallel strands of item [7] using the remaining half bobbin width. Finish

on pin 12.

½ Primary

Start at Pin 2. Wind 35 turns of item [3] in approximately 1 layer. Bring

finish lead back to start. Finish on Pin 1.

Outer Wrap

Wrap windings with 3 layers of tape item [5].

Final Assembly

Assemble and secure core halves. Varnish impregnate (item [8]).

7,8

½ Primary

Bias

½ Primary

3V3 Secondary

5V Secondary

12V & 20V

Secondaries

3mm Margin Tape

0.2mm Thick

Copper Foil

Insulation Tape

10mm

7mm

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