EPR-68 Datasheet, PDF (10/28 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 68 - 6.6 W DC-DC Flyback Converter Using DPA-Switch- (DPA423G)

EP68 3.3 V, 2 A DC-DC Power Supply
7.4 Transformer Build Diagram
Pin Side
1
6,7
9,10
5
4
2
3
19-Jul-2005
Tape
1/2 Primary
Tape
Secondary
Tape
Bias
1/2 Primary
Figure 6 - Transformer Build Diagram.
7.5 Transformer Construction
Bobbin Preparation
½ Primary
Bias Winding
Basic Insulation
Secondary Winding
Basic Insulation
½ Primary
Outer Insulation
Final Assembly
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.
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.
Continue from Pin 2. Wind 10 turns of item [3] in 1 layer. Bring finish lead
back and terminate on Pin 1.
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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www.powerint.com
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