19-Nov-02
EPR-21 – 5 V, 30 W DC-DC Converter
7.3 Transformer Build Diagram
1
½ Primary
Tape
3
7, 8
5, 6
Secondary
3
4
½ Primary
Figure 5 − EP-21 Transformer Build Diagram.
7.4 Transformer Construction
½ Primary
Start at Pin 4. Wind 8 turns of item [3] in 1 layer. Finish on Pin 3.
Use one layer of item [4] for basic insulation.
Basic Insulation
Secondary Winding Start at Pins 5 and 6. Wind 4 quadrifilar turns of item [3]. Finish on Pins 7 and 8.
Basic Insulation
½ Primary
Use one layer of item [4] for basic insulation.
Start at Pin 3. Wind 7 turns of item [3] in 1 layer. Finish on Pin 1.
Wrap windings with 3 layers of tape item [4].
Outer Wrap
Final Assembly
Assemble and secure core halves. Varnish impregnate item [5].
Power Integrations, Inc.
Tel: +1 408 414 9660 Fax: +1 408 414 9760
www.powerint.com
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