GE Industrial Solutions JNCW016A0R Orca Series - Manual (Page 11)

GE
Data Sheet
JNCW016A0R Orca Series; DC-DC Converter Power Modules
36–75 Vdc Input; 28.0Vdc Output; 16Adc Output
August 14, 2013 ©2012 General Electric Company. All rights reserved. Page 11
Thermal Considerations (continued)
Figure 18. Case (T
REF
) Temperature Measurement Location
(top view).
Thermal Derating
Thermal derating is presented for two different applications:
1) Figure 19, the JNCW016A0R module is thermally coupled
to a cold plate inside a sealed clamshell chassis, without any
internal air circulation; and 2) Figure 20 , 21 and 22, the
JNCW016A0R 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.
Ou
tput Cur
rent, I
O
(A)
Cold plate (inside surface) temperature (ºC)
Figure 19. Output Power Derating for JNCW016A0R in
Conduction cooling (cold plate) applications; T
a
<70ºC
adjacent to module; V
IN
= V
IN,NOM
Output
Curr
ent, I
O
(A)
Ambient Temperature, T
A
( o C)
Figure 20. Derating Output Current vs. local Ambient
temperature and Airflow, No Heatsink, Vin=48V, airflow
from Vi(-) to Vi(+).
Ou
tp
ut
C
urr
en
t,
I O
(A)
Ambient Temperature, T
A
( o C)
Figure 21. Derating Output Current vs. local Ambient
temperature and Airflow, 0.5” Heatsink, Vin=48V, airflow
from Vi(-) to Vi(+).
Ou
tp
ut
C
urr
en
t,
I O
(A)
Ambient Temperature, T
A
( o C)
Figure 22. Derating Output Current vs. local Ambient
temperature and Airflow, 1.0” Heatsink, Vin=48V, airflow
from Vi(-) to Vi(+).