EPR-21 – 5 V, 30 W DC-DC Converter
19-Nov-02
7 Transformer Specification
1
WDG #3
7 T
7, 8
5, 6
WDG #2
4 T
#27 AWG
4 X #27 AWG
WDG #1
8 T
#27 AWG
4
Figure 4 – EP-21 Transformer.
7.1 Electrical Specifications
Electrical Strength
Creepage
1 s, from Pins 1-4 to Pins 5-8
Between Pins 1-4 and Pins 5-8
1500 VDC
N/A
Pins 1-4, all other windings open,
measured at 100 kHz, 400 mVRMS
450 µH,
±25%
Primary Inductance
Resonant Frequency
Primary Leakage
Inductance
Pins 1-4, all other windings open
Pins 1-4, with Pins 5-8 shorted,
measured at 100 kHz, 400 mVRMS
3.8 MHz (min.)
1 µH
(max.)
7.2 Materials
Item
Description
[1]
[2]
[3]
[4]
[5]
Core: PR 14 X 8 Ungapped N87 Material Epcos P/N B65755-J-R87
Bobbin: 8 pin P1408 surface mount B&B B-096 or equivalent
Magnet Wire: #27 AWG Double Coated
Tape, Polyester, 3M #1298 or equiv. 4.5 mm wide
Varnish
Power Integrations, Inc.
Tel: +1 408 414 9660 Fax: +1 408 414 9760
www.powerint.com
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