DER-120
22 W Triple Output Flyback – DPA424R
October 26, 2005
7 Transformer Specification
Figure 4 – Transformer Diagram
7.1 Electrical Specifications
Electrical Strength
1 second, from Pins 1-5 to
Pins 6-10
1000 VDC
Creepage
Primary Inductance
Between Pins 1-5 and Pins 6-10
Pins 1,2, all other windings open, measured at
400KHz, 400mVRMS
N/A
40 µH, ±10 %
Resonant Frequency
Primary Leakage Inductance
Pins 1,2, all other windings open
Pins 1,2, with Pins 6-10 shorted, measured at
400KHz, 400mVRMS
5.0 MHz (Min.)
0.75 µH (Max.)
7.2 Materials
Item
Description
[1]
[2]
[3]
[4]
[5]
[6]
Core: EFD20/3F3 or equivalent gap for AL of 133 nH/T2
Bobbin: 10 pin surface mount
Magnet Wire: #32 AWG Double Coated
Foil
Tape, Polyester
Varnish
Power Integrations
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