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RD7

TOPSwitch-II® PC Standby Reference Design Board 90 to 375 VDC Input, 3.5 W Output

Power Integrations, Inc 

RD7

MARGIN WOUND TRANSFORMER CONSTRUCTION

{ TAPE

6, 7

9, 10

3

4

{ TAPE

1

2

SLEEVING

TAPE MARGINS

(4 PLACES)

SECONDARY

BIAS

PRIMARY

WINDING INSTRUCTIONS

Safety Margin

Primary

Basic Insulation

Bias Winding

Reinforced Insulation

Safety Margin

Secondary Winding

Outer Insulation

Final Assembly

Construct margins on each side of bobbin using 3 mm

wide tape. Match height of primary plus bias winding.

Start at Pin 2. Wind one complete layer (about 58 turns)

of 35 AWG heavy nyleze wire from left to right between

margins. Insulate first layer using 1 layer of polyester

tape (polyester film 11.5 mm (0.456 in) wide and 0.056

(2.2 mil) thick) for basic insulation. Wind remaining 58 turns

in second layer from right to left. Finish on Pin 1. Sleeve

start and finish leads using safety approved insulating

sleeving with 0.4 mm (0.016 in) minimum wall thickness.

Apply 1 layer of 11.5 mm wide tape for basic insulation.

Start at Pin 4. Wind 14 parallel bifilar turns of 35 AWG

heavy nyleze wire from left to right in a single layer.

Finish on Pin 3. Sleeve start and finish leads as above.

Apply 3 layers of tape (polyester film, 17.5 mm (0.689 in)

wide and 0.056 mm (2.2 mil) thick) for reinforced

insulation.

Construct margins on each side of bobbin using 3 mm

wide tape. Match height of secondary winding.

Start at Pin 9 and 10. Wind 6 parallel bifilar turns of 26 AWG

heavy nyleze wire from left to right in a single layer. Finish

on Pin 6 and 7. Sleeve start and finish leads as above.

Apply 3 layers of 17.5 mm tape for outer insulation.

Assemble and secure core halves. Impregnate

uniformly with varnish.

Figure 16. Contruction Details of Transformer TRD7-1.

10 B

4/99

PI-2281-062998

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