EPR-12 Datasheet, PDF (22/40 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-12 - 145 W PC Forward Converter with TOP247 and 10 W 5 V Output Standby Flyback with TNY266

EPR-12 – PC Forward Converter with Standby Flyback Power Supply
7.2.3 Transformer Build Diagram
01-Feb-05
Figure 13 - EP-12 10 W Standby Transformer Build Diagram.
7.2.4 Transformer Construction
Primary Layer
Insulation
Bias Winding
Insulation
Secondary Winding
Outer Insulation
Final Assembly
Start at Pin 7. Wind 158 turns of item [3] from left to right, then from right to left
until done. It takes about 3 1/4 layers. Apply 1 layer of tape, item [5] between each
winding layer for basic insulation. Finish the wiring on Pin 5.
1 Layer of tape [6] for insulation.
Start at pin 9. Wind 17 turns of item [5] from left to right. Finish on pin 10.
1 Layer of tape [6] for insulation.
Start at Pin 2. Wind 7 bifilar turns of item [4] from left to right. Wind uniformly, in a
single layer, across entire width of bobbin. Finish on Pin 1.
3 Layer of tape [6] for insulation.
Assemble and secure core halves. Impregnate uniformly [7].
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