TOP245P datasheet(14/35 Pages) POWERINT

14 / 35 page

DER-18

DVD Recorder Supply – TOP245P

March 30, 2004

Page 14 of 35

Power Integrations

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

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6.5

Transformer Construction

Bobbin Preparation

Pull Pins 2, 3 & 4 on bobbin to provide polarization. Place the bobbin with

pins oriented on the right hand side.

Margin

Apply 6 mm wide margin tape on both sides of the bobbin. Match height

of primary windings.

WGD1: Shield

Start at Pin 1. Wind 16 bifilar turns of 30 AWG wire in 1 layer. Cut end

leads floating.

Basic Insulation

Use two layers of 10.5 mm tape for basic insulation.

WGD2: Primary

st -layer)

Start at Pin 5. Wind 30 turns of 29 AWG wire for the 1

st layer.

Basic Insulation

Put one layer of 10.5 mm tape for basic insulation

WGD2: Primary

nd -layer)

Continue winding 26 turns for the 2

ndlayer. Finish on Pin 1.

Basic Insulation

Put two layers of 10.5 mm tape for basic insulation

WGD3: Bias

Start at Pin 6. Wind 8 quadfilar turns of 30 AWG wire in 1 layer. Finish

on Pin 7.

Reinforced

Insulation

Put 4 layers of 22 mm tape for reinforced insulation

Margin

Apply 6 mm wide margin tape on both sides of the bobbin. Match height

of secondary windings.

WGD4: Bias

Start at Pin 16 temporarily. Wind 9 quadfilar turns of 29 AWG wire in 1

layer. Finish on Pin 13. Cut start-leads floating.

Basic Insulation

Put one layer of 10.5mm tape for basic insulation

WGD5/6: 3V/5V

Use prepared cu foil shown in Figure 7. Start at pin 14, wind 1 turn,

terminate at pin 12,continue to wind two turns. Finish at pin 13. Secure

end with 10.5 mm tape.

WGD7: 12V

Start at Pin 15. Wind 4 turns of 26 AWG wire in 1 layer. Spread evenly

across the bobbin. Finish on Pin 14.

WGD8: 33V

Start at Pin 16. Wind 11 turns of 33 AWG wire in 1 layer. Spread evenly

across the bobbin. Finish on Pin 15.

Basic Insulation

Put one layer of 10.5 mm tape for basic insulation

WGD9: - 5V

Start at Pin 13. Wind 3 turns of 26 AWG wire in 1 layer. Spread evenly

across the bobbin. Finish on Pin 11.

WGD10: - 22V

Start at Pin 11. Wind 9 turns of 33 AWG wire in 1 layer. Spread evenly

across the bobbin. Finish on Pin 10.

WGD11: 3V VFD

Start at Pin 8. Wind 2 turns of 33 AWG wire in 1 layer. Spread evenly

across the bobbin. Finish on Pin 9.

Outer Wrap

Wrap windings with 2 layers of 22 mm tape

Core Preparation

Glue core halves together.

Final Assembly

Varnish impregnate

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