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(D) LS200/L series Output Derating versus Ambient Temperature.
The Output Derating with external fan (exhale) 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
nd
2
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
Q1, Q2
D1
D4
D12
C10, C30, C36 & C37
L1
L5, L14
T1
*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.
Parts Name
Mosfet
Bridge Diode
Fast Recovery Diode
Output Diode
Electrolytic Capacitor
Balun Coil
Choke Coil
Transformer
13
TDK-Lambda
LS 200 Series
INSTRUCTION MANUAL
o
Maximum Temperature (
C) *1
110 (130)
110 (130)
100 (130)
100 (130)
80 (105)
100 (130)
100 (130)
100 (110)
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