13
TDK-Lambda
GWS
500
Series
INSTRUCTION MANUAL
The Output Derating with external fan depends on the airflow conditions and the temperature rise for the components.
The method stipulated below provides 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.
*1. Absolute temperature (Maximum temperature) during normal operating conditions. Higher temperature will proba-
bly 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.
Location No
Parts Name
Maximum Temperature (
o
C) *1
D1
Bridge Diode
112 (130)
D16/Q10
Schottky Diode/Mosfet
109 (130)
Q1 Mosfet
123
(130)
Q4 Mosfet
102
(130)
T1 Transformer
125
(130)
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