EPR-54 Datasheet, PDF (20/40 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 54 - 2.75 W Charger/Adapter Using LNK520P

EPR-54 – LinkSwitch 2.75 W Low Cost Charger / Adapter
07-May-2004
8.4 Thermal Performance
The thermal images provide detail of the power supply operating component
temperatures. The images were recorded after operating the unit for 12 hours at 85 VAC
with an output load of 0.5 A at the maximum power point. This provides worst-case
temperature rise on the LinkSwitch device.
The top image details component temperatures of the assembly with the case removed.
Hotspots are visible at LinkSwitch and output diode locations, which reached 53 °C and
66 °C, respectively.
Operating within the closed case generated an internal temperature rise of +15 °C. This
additional temperature rise gives a maximum LinkSwitch and output diode case
temperatures of 68 °C and 81 °C at 24 °C ambient and 93 °C and 106 °C at 50 °C
ambient. These results are well within acceptable operating limits.
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