TOP245P_1 POWERINT [Power Integrations, Inc.], TOP245P_1 Datasheet - Page 11

• Manufacturer Part Number: TOP245P_1
• Description: Title 32W (47W peak) Multiple Output supply
• Manufacturer: POWERINT [Power Integrations, Inc.]

DER-19
7.4 Transformer Build Diagram
7.5 Transformer Construction
Page 11 of 25
Bifilar Bias Winding
Bobbin Preparation
Basic Insulation
Final Assembly
12V and 20V
Outer Wrap
7mm
3V3 and 5V
½ Primary
½ Primary
Insulation
Windings
Windings
3
1
2
2
6
4
10mm
TOP245P Multiple Output Set Top Box
Place 3mm of Margin tape on each side of the EF30 Bobbin
Start at Pin 4. Wind 36 turns of item [3] in approximately 1 layer. Bring
finish lead back to start. Finish on Pin 2.
Use two layers of item [5] for basic insulation.
Starting at Pin 6, wind 9 bifilar turns of item [3]. Spread turns evenly
across bobbin. Finish at Pin 3.
Use three layers of item [5] for safety insulation.
Start at Pins 7 and 8. Wind 2 turns of copper foil [4]. Bring termination
wire out onto pin 9. Continue with one further copper foil turn and finish
with termination on pin 10.
Start at Pin 10. Wind 4 turns of 4 parallel strands of item [7] using half the
bobbin width. Terminate on pin 11. Continue with 4 further turns of 4
parallel strands of item [7] using the remaining half bobbin width. Finish
on pin 12.
Start at Pin 2. Wind 35 turns of item [3] in approximately 1 layer. Bring
finish lead back to start. Finish on Pin 1.
Wrap windings with 3 layers of tape item [5].
Assemble and secure core halves. Varnish impregnate (item [8]).
Figure 5 – Transformer Build Diagram
Tel: [phone] Fax: [phone]
Power Integrations, Inc.
www.powerint.com
0.2mm Thick
Copper Foil
Insulation Tape
March 30, 2004
12
9
7,8
3mm Margin Tape
12V & 20V
Secondaries
11
10
5V Secondary
3V3 Secondary
½ Primary
Bias
½ Primary