DER-55
TNY267 Multi Output Power Supply
April 20, 2005
7.4 Transformer Build Diagram
PIN 6/7
PIN 9
PIN 10
PIN 8
9V/5V/3.3V Winding
Balance Winding
PIN 1
PIN 2
Primary Winding
PIN 4
PIN 3
PIN 1
Core Shield Winding
Figure 5 – Transformer Build Diagram
7.5 Transformer Construction
Start at Pin1. Wind 14 bifilar turns of item [3] from left to right covering a
single full layer. Finish at Pin3.
1 layer of item [6] for mechanical fixing.
Core Shield
Tape
Start at Pin 4. Wind 59 turns of item [4] in 2 layers (about 32T in the first
Layer and 27T in the second Layer) from left to right (Isolated with one
layer tape item [6]). Finish on Pin2.
Primary
Basic Insulation
Balance Winding
Insulation
1 layer of item [6] for basic insulation.
Start on pin 1 using item [5] at the start leads. Wind 1 turns of copper
shield. Apply next step tape item [6] first before close this winding to avoid
copper shortage.
Use 2 layers of item [6] for basic insulation
Start at Pin 10. Wind 2 turns of item [4] from right to left. Terminate on Pin
9. In the same layer start at Pin 9. Wind 1 bifilar turn of item [4] and
terminate on Pin 6. Again in the same layer start at Pin 7. Wind 2 trifilar
turns of item [4] and terminate on Pin 8.
9V, 5V and 3V3
Winding
Outer Wrap
Wrap windings with 2 layers of tape item [6].
Assemble and secure core halves so that the tape wrapped EF core is at
the bottom of the transformer. Varnish impregnate (item [7]).
Final Assembly
Power Integrations
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