EPR-31 Datasheet, PDF (18/36 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-31 Multiple Output 180 W AC-DC Power

EPR-31 – Multi Output, 180 W, PC Main Power Supply
7.1.4 Transformer Build Diagram
01-Feb-05
14
13
8, 9/B
10, 11, 12/A
3
4
2
1
Secondary
Bias
Primary
Margin Tape
Figure 11 – 180 W Forward Transformer Build Diagram.
7.1.5 Transformer Construction
Margin Taping
Primary Winding
Basic Insulation
Margin Taping
Bias Winding
Reinforced Insulation
Copper Foil Winding
(5 V)
Reinforced Insulation
Margin Taping
12 V Winding
Outer Insulation
Pins Clipped off
Use item [9] for the right and left margins.
Start at pin 1. Wind 40 turns of item [3] from left to right. Wind
uniformly in a single layer across entire width of bobbin. End at
pin 2.
1 Layer of tape [8] for basic insulation.
Use item [9] for the right and left margins.
Start at pin 4. Wind trifilar 6 turns of item [4] from left to right.
Wind uniformly in a single layer across entire width of bobbin.
End at pin 3.
3 Layer of tape [7] for insulation.
Prepare copper ribbon [6] as shown in Figure 3. Match pin A of
the foil to pin 10, 11, or 12 of the bobbin. Wind 3 turns of item
[6]. Then, finish by matching pin B of the foil to pin 8 or 9 of the
bobbin.
3 Layers of tape [7] for insulation.
Use item [9] for the right and left margins.
Start at pin 13. Wind bifilar 4 turns of item [5] from left to right.
Wires are populated in middle of bobbin. Finish at pin 14.
Add 3 Layers of tape [7] for insulation.
Pins 6 and 7.
Power Integrations
Tel: [phone] Fax: [phone]
www.powerint.com
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