DER-55
TNY267 Multi Output Power Supply
April 20, 2005
7 Transformer Specification
7.1 Electrical Diagram
10
9
NC
Balance
1 Turn
Copper Foil
9V
2 Turns
1*0.40mm Triple
1
Core
18 Turns
2*0.28mm Heavy Nyleze
5V
1 Turn
2*0.40mm Triple
3
8
2
Primary
3V3
59 Turns
0.28mm Heavy
4
2 Turns
3*0.40mm Triple
6/7
EF20
Figure 4 –Transformer Electrical Diagram
7.2 Electrical Specifications
Electrical Strength
1 second, 60 Hz, from Pins 2-4 to Pins 6-10
Pins 2-4, all other windings open, measured at
100 kHz, 0.4 VRMS
3000 VAC
1340µH, -
0/+20%
Primary Inductance
Resonant Frequency
Primary Leakage Inductance
Pins 2-4, all other windings open
Pins 2-4, with Pins 6-10 shorted, measured at
100 kHz, 0.4 VRMS
950 kHz (Min.)
50 µH (Max.)
7.3 Materials
Item
Description
[1]
[2]
[3]
[4]
[5]
[6]
[7]
Core: PC40EF20-Z, TDK or equivalent Gapped for AL of 327 nH/T2
Bobbin: EF20 Horizontal 10 pin
Magnet Wire: 0.28mm
Triple Isolated Wire: 0.4mm
Copper Foil: 0.1mm*12mm
Tape: 3M 1298 Polyester Film, 2.0 mils thick, 12 mm wide
Varnish
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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