GE Industrial Solutions JRCW450R Orca Series - Manual (Page 11)

GE
Data Sheet
JRCW450R Orca Series; DC-DC Converter Power Modules
36–75 Vdc Input; 32.0Vdc Output; 450W Output
May 8, 2013 ©2012 General Electric Company. All rights reserved. Page 11
Figure 17. Case (T
REF
) Temperature Measurement Location
(top view).
Thermal Derating
Thermal derating is presented for two different applications:
1) Figure 18, the JRCW450R module is thermally coupled to a
cold plate inside a sealed clamshell chassis, without any
internal air circulation; and 2) Figure 19, 20 and 21, the
JRCW450R module is mounted in a traditional open chassis or
cards with forced air flow. In application 1, the module is
cooled entirely by conduction of heat from the module
primarily through the top surface to a cold plate, with some
conduction through the module’s pins to the power layers in
the system board. For application 2, the module is cooled by
heat removal into a forced airflow that passes through the
interior of the module and over the top base plate and/or
attached heatsink.
Out
put Pow
er (
W
)
Cold plate (inside surface) temperature (ºC)
Figure 18. Output Power Derating for JRCW450R in
Conduction cooling (cold plate) applications; T
a
<70ºC
adjacent to module; V
IN
= V
IN,NOM
Output C
urrent, I
O
(A
)
Ambient Temperature, T
A
( o C)
Figure 19. Derating Output Current vs. local Ambient
temperature and Airflow, No Heatsink, Vin=48V, airflow
from Vi(-) to Vi(+).
Output C
urr
en
t,
I O
(A)
Ambient Temperature, T
A
( o C)
Figure 20. Derating Output Current vs. local Ambient
temperature and Airflow, 0.5” Heatsink, Vin=48V, airflow
from Vi(-) to Vi(+).
Output
Cur
rent, I
O
(A)
Ambient Temperature, T
A
( o C)
Figure 21. Derating Output Current vs. local Ambient
temperature and Airflow, 1.0” Heatsink, Vin=48V, airflow
from Vi(-) to Vi(+).