TDK-Lambda EFE300 Mode D'emploi page 15

EFE300 Handbook
where T1 = peak power time on
and T2 = reduced power time on
Maximum continuous power output 300W (excluding fan output)
Output limitations
All outputs are SELV.
All outputs have functional spacings to earth, and due consideration must be given to this in the end product design.
Customer Air Cooling (CN, CU and CC 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 the standard concerned.
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.
Circuit Ref.
J1 Input connector
L1, L2 Common mode choke winding
C7, C8 X capacitors
C9 Reservoir capacitor (electrolytic)
L3 Boost choke winding
TX2 Transformer winding
TX2 Transformer core
TX2 Transformer braid
U2 Optocoupler
C10, C11 Channel 1 output capacitors
L6 Primary choke (24V model only)
L4 Channel 1 Output choke
XU2/XU8 Fan regulator
XQ201 Boost FET (IMS board)
Q1 Channel 1 output FET (adjacent to R4)
XU3 Primary driver IC
Various All other electrolytic capacitors
See components to be monitored later.
Higher temperatures limits (in brackets) may be used but product life may be reduced.
Input Connections
Molex 3 pin header 7A/250Vac.
Capacitive Loads
EFE300 is 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. Consult factory for details.
Capacitive loading table
Nominal output voltage
Max Capacitive load ( F)
μ
Peak current for switched
capacitive loads (A)
Description
12
25000
33.3
24
12500
16.6
Page 15 of 20
Max. Temperature
(°C)
75
115 (130)
100
60 (105)
115 (140)
120 (130)
120 (130)
120 (130)
75 (100)
80 (105)
120 (130)
115 (130)
115 (130)
115 (130)
115 (130)
100 (130)
80 (105)
48
3125
7.4
17358 issue 14, October 2018