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The Output Derating with external fan depends on the airflow conditions and the temperature rise for the components.
The method stipulated below provide a way to decide for the safe operation of this power supply. As shown, this table
provides a list of the maximum temperature allowed for specified components. The component temperature is measured
according to IEC60950-1 2nd edition Clause 4.5.
Maximum rated temperature for these components are taken from the component specification provided by the original
manufacturers. These are the worse case allowable temperature.
Temperature is measured using thermal couple K-type, and using CYANOACRYLATE adhesive or equivalent to secure
to the hottest point of these components.
In order to decide the worse case temperature rise, the selected measurement point should not face direct airflow and the
equipment powered should operate under worse case operating conditions.
Location No
D1
D18/Q11
C14
*1. Absolute temperature (Maximum temperature) during normal operating conditions.
Higher temperature will probably cause shorter life span for the power supply.
Please refer to the component side layout drawing below for temperature measurement.
Airflow should cool down all the components evenly.
Parts Name
Bridge Diode
Schottky Diode/Mosfet
Electrolytic Capacitor
T1
Transformer
Maximum Temperature (
100 (130)
85 (130)
60 (105)
95 (130)
17
TDK-Lambda
GWS 2
Series
50
INSTRUCTION MANUAL
o
C) *1
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