TDK-Lambda EFE400 Handbuch Seite 15

EFE400 Handbook
where T1 = peakpower time on
and T2 = reducedpower time on
Maximum continuous power output 400W (excluding fan output)
All outputs are SELV.
All outputs have functional spacings to earth, and due consideration must be given to this in the end product design.
Cooling for units with customer supplied air (open frame, U and C options)
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 IEC60950-1:2005 Clause
4.5. 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 handbook/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.
COMPONENTS TO BE MONITORED
Circuit Ref.
J1
L1, L2
C7, C8
C9
L3
TX2
TX2
TX2
U2
C11
L7
L4
XU8
XQ225
Q1
XU3$
Various
See components to be monitored diagram below.
* For temperatures above 75°C a suitably temperature rated mating connector must be used.
$ optional
Higher temperatures limits (in brackets) may be used but product life may be reduced.
Capacitive loads
EFE400 are designed for use with capacitive loads up to the value shown in the table below.
Applications where a discharged capacitor is switched onto the power supply output create additional loading for
which a non standard product may be required if the peak current exceeds the value in the table below.
Description
Input connector
Common mode choke winding
X capacitors
Reservoir capacitor (electrolytic)
Boost choke winding
Transformer winding
Transformer core
Transformer braid (to pin 13)
Optocoupler
Channel 1 output capacitor
Channel 1 Output choke
Primary choke (24V model only)
Fan regulator
Boost FET (IMS board)
Channel 1 output FET
Main driver IC
All other electrolytic capacitors
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Max. Temperature (°C)
75* (105)
115
100
70 (105)
115
120
120
120
75
90 (105)
115
120 (130)
95
115
115
100
90 (105)
17333 issue 16, Dec 2014