Data Sheet
GE
JRCW450R Orca Series; DC-DC Converter Power Modules
36–75 Vdc Input; 32.0Vdc Output; 450W Output
Ambient Temperature, TA (oC)
Figure 17. Case (TREF ) Temperature Measurement Location
(top view).
Figure 19. Derating Output Current vs. local Ambient
temperature and Airflow, No Heatsink, Vin=48V, airflow
from Vi(-) to Vi(+).
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.
Ambient Temperature, TA (oC)
Figure 20. Derating Output Current vs. local Ambient
temperature and Airflow, 0.5” Heatsink, Vin=48V, airflow
from Vi(-) to Vi(+).
Cold plate (inside surface) temperature (ºC)
Figure 18. Output Power Derating for JRCW450R in
Conduction cooling (cold plate) applications; Ta <70ºC
adjacent to module; VIN = VIN,NOM
Ambient Temperature, TA (oC)
Figure 21. Derating Output Current vs. local Ambient
temperature and Airflow, 1.0” Heatsink, Vin=48V, airflow
from Vi(-) to Vi(+).
May 8, 2013
©2012 General Electric Company. All rights reserved.
Page 11
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
