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11-Feb-13
RDR-91 12 V, 1 A, Universal Input Supply
7.4
Transformer Build Diagram
6
8
5
2 mm
1 layer of tape
2
4
1
3
1
2 mm
Margin
Tape
Figure 5 – Transformer Build Diagram.
Bias Winding
Primary Winding
1 layer of tape
Cancellation Winding
No Connect
7.5
Transformer Construction
Bobbin Set Up
Orientation
Margin Tape
WD1
Cancellation Winding
Insulation
WD#2
Primary winding
Insulation
WD #3
Bias Winding
Insulation
WD #4
Bias Winding
Insulation
Margin Tape
WD #5
Secondary Winding
Outer Insulation
Core Assembly
Varnish
Page 13 of 35
Set up the bobbin with its pins oriented to the left hand side.
Apply 2.0 mm margin at the pin side of bobbin using item [6]. Match combined
height of shield, primary, and bias windings.
Start at pin 1. Wind 14 bifilar turns of item [3] from left to right. Wind with tight
tension across entire bobbin evenly. Cut the ends of the bifilar and leave
floating.
1 layer of tape [7] for insulation.
Start at pin 3. Wind 28 turns of item [3] from left to right. Apply 1 layer of tape [7]
for insulation. Wind another 28 turns from right to left. Wind with tight tension
across entire bobbin evenly. Finish at pin 1.
1 layer of tape [7] for insulation.
Start at Pin 4, wind 6 trifilar turns of item [5]. Wind from left to right with tight
tension. Wind uniformly, in a single layer across entire width of bobbin. Finish on
pin 2.
1 layer of tape [7] for insulation.
Start at pin 2, wind 6 trifilar turns of item [5] from left to right with tight tension.
Wind uniformly, in a single layer across entire width of bobbin. Finish on pin 5.
1 layer of tape [8] for insulation.
Apply 2.0 mm margin at the pin side of bobbin using item [6]. Match combined
height of secondary windings.
Start at pin 8, wind 7 turns of item [5] from left to right. Wind uniformly, in a
single layer across entire bobbin evenly. Finish on pin 6.
3 layers of tape [8] for insulation.
Assemble and secure core halves using item [1] and item [9].
Dip varnish using item [10] (do not vacuum impregnate).
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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