TDK-Lambda EFE400M Mode D'emploi page 18

EFE400M Instruction Manual
Cooling for units with customer supplied air (all models except -BC and -EC)
The following method must be used for determining the safe operation of PSUs.
The components listed in the following table must not exceed the temperatures given. To determine the component
temperatures the heating tests must be conducted in accordance with the requirements of the standard in question.
Consideration should also be give to the requirements of other safety standards. Test requirements include: PSU to
be fitted in its end-use equipment and operated under the most adverse conditions permitted in the end-use
equipment instruction manual/specification and which will result in the highest temperatures in the PSU. To
determine the most adverse conditions consideration should be given to the end use equipment maximum operating
ambient, the PSU loading and input voltage, ventilation, end use equipment orientation, the position of doors &
covers, etc. Temperatures should be monitored using type K fine wire thermocouples (secured with cyanoacrylate
adhesive, or similar) placed on the hottest part of the component (out of any direct airflow) and the equipment should
be run until all temperatures have stabilised.
Cooling for unit temperature table (see layout drawings below):
Circuit Ref. Description
J1 input connector
C12, C8, C7 X cap
L1, L2 Common mode choke winding
L6 Series mode choke winding
TX1 Standby trx winding
U2, U3, U5, U6, Opto-coupler
U7
Primary, secondary windings and
TX2
core
C5 Capacitor
C9 Boost capacitor
L3 Boost choke winding
L7 Channel 1 output choke
XQ225 Boost FET (ASY2 primary IMS)
Q2 Channel 1 output FET (ASY4
secondary IMS)
L8 Primary resonant choke (not 12V
model)
J2 Output connector
XL701 1A fan output choke
C1, C11, C19, Electrolytic capacitors
† The higher temperatures limits in brackets may be used but product life may be reduced.
C20
†† Molex Sabre type connector.
Max. Temperature
(°C) †
105 (75††)
100
130 (145)
130
130
100
130
85 (105)
70 (105)
130 (140)
130
125 (130)
125 (130)
130 (140)
105
110 (125)
75 (105)
Page 18 of 27 23198 issue 19, February 2022