DER-50
Set Top Box Design using TOP245R
April 20, 2005
7 Transformer Specification
7.1 Electrical Diagram
Core Shield
16 Turns
2*0.25 Heavy Nyleze
1
10
23V
1/2 Primary
3
30
2*0.40mm Heavy
2
9
8
1/2 Primary
18V
7
30
3
4
0.25mm Heavy
2*0.40mm Heavy
Bias
5V
2*0.25mm Heavy
6 0.10mm CU
5
3V3
2
0.10mm CU
7
EF25
Figure 4 –Transformer Electrical Diagram
7.2 Electrical Specifications
Electrical Strength
Primary Inductance
1 second, 60 Hz, from Pins 1 - 3 to Pins 7 - 10
Pins 1-3, all other windings open, measured at
100 kHz, 0.4 VRMS
3000 VAC
504 µH, -0/+20%
Pins 1-3, with Pins 7-10 shorted, measured at
100 kHz, 0.4 VRMS
Primary Leakage Inductance
20 µH (Max.)
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
Page 11 of 31
POWERINT [ Power Integrations ]
