EPR-54 – LinkSwitch 2.75 W Low Cost Charger / Adapter
07-May-2004
7.3 Materials
Item
[1]
Description
Core: EE16, PC40EE16 TDK – ALG 252 nH/T2
[2]
Bobbin: Horizontal 10 pin (see Section 7.6)
[3]
[4]
Magnet Wire: #32 AWG, Please see note on next page
Foil: Tape Wrapped Copper Foil, 7. 5 mm +/-0.1 mm wide by 0.05 mm/2 mil thick, 35 mm
+/- 0.5 mm length – see additional drawing
[5]
[6]
Triple Insulated Wire: #30 AWG
Magnet Wire: #31 AWG, Please see note on next page
[7]
Tape: 3M 1298 Polyester Film (white) 322 mils (8.2 mm) wide by 2.2 mils thick
Tape: 3M 1298 Polyester Film (white) 291 mils (7.4 mm) wide by 2.2 mils thick
Tape: 3M 1298 Polyester Film (white) 586 mils (14.9 mm) wide by 2.2 mils thick
Tape: 3M 1298 Polyester Film (white) 196 mils (5.0 mm) wide by 2.2 mils thick
Barrier Tape: 2.0 mm wide, 0.15 mm thick, Please see the note on the next page
Barrier Tape: 2.25 mm wide, 0.15 mm thick, Please see the note on the next page
Glue AV118
[8]
[9]
[10]
[11]
[12]
[13]
Note: The transformer is an integral part of the EMI performance of this design.
Changes to the transformer, even very minor, may have significant impact on both
conducted and radiated EMI. More specific guidance is given below when
attempting to repeat this transformer design.
1. Wire gauge selection for core cancellation, secondary and bias windings
•
The outside diameter of the wire can vary slightly due to variations in the insulation
thickness although the bare copper area diameter is same.
•
Changing the wire gauge is acceptable to account for overall wire diameter
differences. The wire gauge/size should be selected such that with the specified
number of turns the winding completely fills one complete layer.
•
•
The bias winding can have the number of turns varied by up to 2 turns to make a
complete layer if necessary but it is preferred to keep the turns as specified.
Winding information with wire gauge used should be indicated on sample report.
2. Primary winding
•
Use the same wire gauge/size as used for the core cancellation winding.
3. Barrier tape
•
•
Transformer vendors may have different thickness of barrier tape.
If the thickness is different, please make the height of the barrier tape the same or
slightly higher than wire thickness used for that winding.
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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