DER-96 datasheet(15/33 Pages) POWERINT

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DER-96

10 W VoIP

September 12, 2005

Page 15 of 33

CONFIDENTIAL

Power Integrations

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

8.4

Transformer Build Diagram

Tape

FL1

FL2

Tape

Figure 4 – Transformer Build Diagram

8.5

Transformer Construction

Start at Pin 4. Wind 30 turns item [3a]. Finish on pin 3

Tape

Use layer of item [6].

Start at Pin 1. Wind 12 turns item [3b]. Spread evenly across bobbin.

Finish on pin 2

Tape

Use layer of item [6].

Start at Pin 2. Wind reverse direction 1.5 turns of item [4]. Finish winding

and leave floating in stack.

Tape

Use layer of item [6].

Start at Pins 7. Wind 3 turns quad-filar item [3a]. Spread evenly across

bobbin. Finish temporarily on pin 1.

Start at Pin 8. Wind 2 turns tri-filar item [3a]. Spread evenly across

bobbin, filling in the gaps in the previous W3. Finish on pin 6.

Move temporary connection from Pin 1 to Pin 5.

Tape

Use layer of item [6].

Start at FL2. Wind 6 turns item [3a]. Spread evenly across bobbin. Finish

on FL1.

Outer Wrap

Wrap windings with 3 layers of tape [item [7].

Core Ground

Use copper self-adhesive tape touching core on all four sides. Make

connection from this tape to pin 2 of bobbin. Note: this is not a “belly-

band”, this is instead purely to electrically ground the core

Final Assembly

Assemble and secure core halves. Varnish impregnate (item [8]).

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