5
TDK-Lambda
LS
25-150
Series
INSTRUCTION MANUAL
5. Mounting Directions
5-1. Output Derating according to the Mounting Directions
Recommended standard mounting is Method ( A ). Method ( B ), ( C ) and ( D ) are also possible. Refer to the Output
Derating below. Please do not use installation Method ( E ), where the PCB will be on the topside and heat will be
trapped inside the unit.
In the following derating curve, the maximum output current is denoted as 100%.
`
(A)
Output Derating versus Ambient Temperature (Convection Cooling)
LS25-3.3
Output Derating Vs Ambient Temperature
0
20
40
60
80
100
120
-25
0
25
50
75
100
Ambient Temperature (
o
C)
Load (%)
Mounting
A & D
Mounting
B & C
50
40
65 70
