EPR-29 – 4 Output, 11 W, Universal Input, DVD Supply
07-July-03
7.5 Copper Foil Preparation
The following figure shows the copper foils to be used for +3.3 V and +5 V outputs (W6
and W7)
#26 Copper
Connect Pin 9
Finish Pin 13
#26 Copper
Wire
Start Pin 11
Wire
45 mm
105 mm
+3.3 VOUT 2T Copper Foil 14.0 mm
0.12 mm Thick.
+5 VOUT 1T Copper Foil 14.0 mm
0.12 mm Thick.
Figure 6 – Foil Winding Preparation Diagram.
7.6 Winding Instructions
Bobbin Set Up
Orientation
Set up the bobbin with its pins oriented to the right hand side.
Apply 3.0 mm margin at each side of bobbin using item [8]. Match combined
height of primary, shield and bias windings.
Margin Tape
Start with a floating lead. Wind 32 bifilar turns of item [3] from left to right.
Wind tightly and uniformly across entire width of bobbin. Finish at pin 5 using
item [4] at the finish leads. Cut the starting lead just at the starting of the
winding.
W1 First Shield
Basic Insulation
Apply one layer of tape item [6].
Start on pin 1 using item [4] at the start leads. Wind 32 bifilar turns of item [3]
from right to left . Apply one layer of item [6]. Continue the same wire on
second layer. Wind 32 turns from left to right. The two layers should be
wound tightly with the turns uniformly distributed across entire width of
bobbin. Finish on pin 4 using item [4] at the finish leads.
Apply one layer of tape item [6].
Start on pin 7 using item [4] at the start leads. Wind 6 turns of 4 parallel wires
of item [3]. Wind from right to left in a single layer. The wires should be wound
tightly and uniformly spread across the bobbin width. Finish on pin 6 using
item [4] at the finish leads.
W2 Two Layers
Primary
Basic Insulation
W3 Bias
Basic Insulation
W4 Second shield.
Apply one layer of tape item [6].
Start with a floating lead. Wind 4 turns of 4 parallel wires of item [3]. Wind
from right to left in a single layer. The wires should be wound tightly and
uniformly spread across the bobbin width. Finish on pin 7 using item [4] at the
finish leads. Cut the starting lead just at the starting of the winding.
3 Layers of tape [7] for insulation.
Insulation
Apply 3.0 mm margin at each side of bobbin using item [8]. Match combined
height of secondary windings.
Margin Tape
Start on pin 13 using item [4] at the start leads. Wind tightly 4 turns of 4
parallel wires of item [3]. Wind from right to left in a single spread across the
bobbin width. Finish on pin 8 using item [4] at the finish leads.
Apply one layer of tape item [6].
W5 +12 VOUT
Basic Insulation
Power Integrations, Inc.
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
Page 12 of 36
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