EPR-54 Datasheet, PDF (11/40 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 54 - 2.75 W Charger/Adapter Using LNK520P

07-May-2004
EPR-54 – LinkSwitch 2.75 W Low Cost Charger / Adapter
7 Transformer Specification
Note: To correctly center the output voltage over a junction temperature of 25 °C to 65 °C
(approx ambient 0 °C to 40 °C), the design software and design methodology may
produce a slightly different transformer design than the one shown here.
7.1 Electrical Diagram
WDG #1
Shield ³
33T #32 AWG
1
1
Primary
WDG #2
100T #32 AWG
2
7
Secondary
8T #30 T.I.W
6
WDG #3
WDG #4
4
Shield & Bias
26T #31 AWG
5
Figure 5 – Transformer Electrical Diagram.
7.2 Electrical Specifications
Electrical Strength
Primary Inductance
Resonant Frequency
Primary Leakage Inductance
1 second, 60 Hz, from Pins 1-5 to Pins 6-10
Pins 1-2, all other windings open, measured at
100 kHz, 0.4 VRMS
Pins 1-2, all other windings open
Pins 1-2, with Pins 6-7 shorted, measured at
100 kHz, 0.4 VRMS
3000 VAC
2.52 mH, +/-10%
400 kHz (Min.)
80 µH (Max.)
Page 11 of 40
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