EPR-16 - LinkSwitch 2.75 W Charger/Adapter
17-May-04
7.5 Transformer Construction
Start at Pin 4 temporarily. Wind 15 turns of item [5] from right to left with
Secondary Winding tight tension. Wind uniformly, in a single layer across entire width of
bobbin. Finish on Pin 6.
Basic Insulation
1 Layer of tape [6] for insulation.
Secondary Winding Change the start pin connection of secondary winding from Pin 4 to Pin 5.
Basic Insulation
Cancellation
Winding
Basic Insulation
Primary Winding
2 2/3 Layer
1 Layer of tape [6] for insulation.
Start at Pin 3. Wind 12 turns of bifilar item [4] from right to left with tight
tension. Wind uniformly, in a single layer, across entire width of bobbin.
Finish on Pin 4.
1 Layer of tape [6] for insulation.
Start at Pin 4. Wind 104 turns of item [3] from right to left in 2 and 2/3
layers across entire width of bobbin. Wind all layers with tight tension.
Finish on Pin 1.
Outer Insulation
Core Assembly
Flux / Belly band
Basic Insulation
10 Layer of tape [7] for insulation.
Assemble and secure core halves using item [8]
Place item [9] around outside of windings and core halves with tight
tension. Make electrical connection to band from pin 3 using item [4].
2 layers of tape [6] for insulation.
Crop Unused Pins Remove pins 7 and 8
Note: The transformer is an integral part of the EMI performance of this design. Changes
to the transformer may have significant impact on both conducted and radiated EMI.
Power Integrations
Page 16 of 36
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