DER-75
2.4W Power Supply using LNK520P
September 12, 2005
Transformer Specification
6.1 Electrical Diagram
2
W1: 39T
1 x 34 AWG
1
3
7
8
W4: 12T
1 x 26 TIW
W2: 114T
1 x 35 AWG
4
3
W3: 13T
2 x 31 AWG
FL1
Figure 4 – Transformer Electrical Diagram
6.2 Electrical Specifications
Electrical Strength
1 second, 60 Hz, from Pins 2-1,3-4 to Pins 6-5
Pins 4-3, all other windings open, measured at
100 kHz, 0.4 VRMS
3000 VAC
2390 µH, -
0/+20%
Primary Inductance
Resonant Frequency
Primary Leakage Inductance
Pins 4-3, all other windings open
Pins 4-3 with Pins 7-8 shorted, measured at
100 kHz, 0.4 VRMS
300 kHz (Min.)
100 µH (Max.)
6.3 Materials
Item
[1]
[2]
Description
Core: TDK PC40 EE13, AL = 185 nH/T2
Bobbin: EE13 Horizontal
[3a]
[3b]
[3c]
[3d]
[4a]
[6]
Magnet Wire: 34 AWG
Magnet Wire: 35 AWG
Magnet Wire: 31 AWG
Triple Insulated Wire: 26 AWG (TIW)
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Power Integrations
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