EPR-29 Datasheet, PDF (23/36 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-29 - Multiple Output 11 W (15.5 W peak) AC-DC Power Supply using TNY268P

07-July-03
EPR-29 – 4 Output, 11 W, Universal Input, DVD Supply
10 Thermal Performance
A thermal image was taken of a unit painted matt black to indicate component
temperatures. In addition a thermocouple was attached at the SOURCE pins of U1 to
provide a more accurate measurement. For reference the board silk screen has been
overlaid.
Figure 15 – EP-29 Thermal Performance.
Ambient temperature was 23 °C. The SOURCE pins of U1 were measured to be 54 °C
at pin 7 and 8 under typical load (11 W) and 90 VAC input. The hottest component on
the board can be seen to be D11 at approximately 60 °C.
These results are acceptable; under high ambient conditions all components would be
expected to remain below 100 °C.
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