EP68 3.3 V, 2 A DC-DC Power Supply
19-Jul-2005
7.4 Transformer Build Diagram
Pin Side
Tape
1
1/2 Primary
Tape
6,7
Secondary
9,10
Tape
5
4
Bias
2
3
1/2 Primary
Figure 6 - Transformer Build Diagram.
7.5 Transformer Construction
Arrange bobbin & rotation such that primary start/finish wires do not
overlap.
Start at Pin 3. Wind 10 turns of item [3] in 1 layer. Bring finish lead back
and terminate on Pin 2.
Bobbin Preparation
½ Primary
Starting at Pin 4, wind 8 turns of item [3]. Spread turns evenly across
bobbin in a single layer. Bring finish lead back and terminate on Pin 5.
Use one layer of item [5] for basic insulation.
Start at Pins 9 and 10. Wind 2 turns of bifilar item [4] in 1 layer. Bring
finish lead back and terminate on Pins 6 and 7.
Use one layer of item [5] for basic insulation.
Bias Winding
Basic Insulation
Secondary Winding
Basic Insulation
½ Primary
Continue from Pin 2. Wind 10 turns of item [3] in 1 layer. Bring finish lead
back and terminate on Pin 1.
Outer Insulation
Final Assembly
Use one layer of item [5] for basic insulation.
Assemble and secure (glue or clamp, item[6]) core halves.
Dip varnish item [7] and cure.
Power Integrations
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