TDK-Lambda QM5 Mode D'emploi page 23

QM5 AND QS5 HANDBOOK
Component temperatures, for customer air cooled models, must be monitored in the end use application as
described in the "Cooling for Unit Temperature Table" below.
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 given 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.
Cooling for Unit Temperature Table:
Circuit Ref.
PFC
QM5
L2
L4
C2
C10
C7
C8
C11
C3, C14,
C12
TX1
D1
D3
U4
U3
Q2
Low Power Options
U6
High Power Options
C6
XU3
TX1
'Q' PMbus
XU3
DM/DH Modules
C206
C207
U8
Q1
D201
TX1
SC module Modules
C206
C209
U1
TX1
TX1 (12V)
Q1
Q203
SB module Modules
C206
C209
U1
TX1
Q1
Description
-
-
Common Mode Choke
Boost choke
Electrolytic Capacitors
Electrolytic Capacitors
Electrolytic Capacitors
Electrolytic Capacitors
Electrolytic Capacitors
X Capacitor
Y Capacitors
Fly back Transformer
Diode bridge
PFC diode
Opto-coupler
Voltage regulator
Boost FETS
-
Opto-couplers
-
Electrolytic Capacitors
Opto-couplers
Transformer Class F
Opto-couplers
-
Y Capacitors
Electrolytic Capacitors
Opto-couplers
Primary FET
Output diode
Transformer Class B
-
Electrolytic Capacitors
Y Capacitors
Opto-couplers
Transformer Class B
Transformer Class F
Primary FET
Secondary FET
-
Electrolytic Capacitors
Y Capacitors
Opto-couplers
Transformer Class B
Primary FET
Page 23 of 37
Max. Temperature (°C)
-
-
115 (140)
125
71 (105)
71 (105)
64 (105)
60 (105)
77 (105)
100
105
120
118 (130)
130
100
120 (130)
130
-
100
-
73 (105)
100
130
100
-
105
84 (105)
100
120 (130)
124 (130)
110
-
83 (105)
105
100
110
130
127 (130)
130
-
83 (105)
105
100
110
127 (130)
260362-07, Mar 2020