EPR-31 Datasheet, PDF (17/36 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-31 Multiple Output 180 W AC-DC Power

01-Feb-05
EPR-31 – Multi-Output, 180 W, PC Main Power Supply
7 Transformer Specification
7.1 180 W Forward Transformer
7.1.1 Electrical Diagram
2
40T
#26
12 V
14
4T
2 x #20
1
3
6T
3 x #30
4
13
8, 9, 10
5V
3T
Ribbon
RTN
11, 12
Figure 10 – 180 W Forward Transformer Electrical Diagram.
7.1.2 Electrical Specifications
Electrical Strength
Primary Inductance
Resonant Frequency
Primary Leakage Inductance
1 minute, 60 Hz, from Pins 1-7 to Pins 10-14
All windings open
All windings open
Across pins 1–2, with Pins 8,9,10–11,12 3–4, and
13–14 shorted, measured at 100 kHz, 0.4 V_RMS
3000 VAC
3.0 mH or Higher
0.2 MHz (Min.)
8 µH (Max.)
7.1.3 Materials
Item
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
Description
Core: PC40 EER28L–Z (TOK)
Jinn Bo Bobbins: #JB-0039
Magnet Wire: #26 AWG Heavy Nyleze
Magnet Wire: #30 AWG Heavy Nyleze
Magnet Wire: #20 AWG Heavy Nyleze
Copper ribbon (foil) 0.670” wide x 0.008” thick
Tape: 3M 1298 Polyester Film (white) 21.8 mm wide by 2.2 mils thick
Tape: 3M 1298 Polyester Film (white) 15.8 mm wide by 2.2 mils thick
Tape: 3M 44 Margin tape (cream) 3.0 mm wide by 5.5 mils thick
Page 17 of 36
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