EPR-85 Datasheet, PDF (18/32 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 85 - 2 W Charger using LinkSwitch-LP

EP-85 6 V, 330 mA Low Cost Charger
04-Oct-2005
9 Thermal Performance
High temperature testing was completed in a sealed adapter enclosure at elevated
ambient of 45 °C under conditions of natural convection. Input voltage was set to
90/265 VAC with 47 Hz line frequency. The output was adjusted to maintain full load
1.93 W and 2.1 W, respectively.
Thermocouple
Location
LNK564P, pins 1,2
Bulk Input Capacitor
Transformer
Output Rectifier
Reference
U1
C1
T1
D4
Measured Temperature Rise (°C)
90 VAC, 1.93 W_OUT
37.1
16
14
40
265 VAC, 2.1 W_OUT
55
12
17
43
All temperatures are regarded as well within normally acceptable operating temperature
ranges.
An infrared thermograph was taken of the unit operating open frame at room ambient.
This confirms that the correct components were selected for temperature measurement
in the table above and that high line is worst case for U1.
Power Integrations
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