GE Industrial Solutions QBVS050A0B Barracuda Series - Manual (Page 9)

GE
Data Sheet
QBVS050A0B Barracuda Series; DC-DC Converter Power Modules
52-60Vdc Input; 12.0Vdc, 50.0A, 600W Output
October 31, 2013 ©2012 General Electric Company. All rights reserved. Page 9
Feature Descriptions (continued)
Figure 16. Location of the thermal reference temperature
TH
1
for base plate module.
Heat Transfer via Convection
The thermal data presented here is based on physical
measurements taken in a wind tunnel, using automated
thermo-couple instrumentation to monitor key component
temperatures: FETs, diodes, control ICs, magnetic cores,
ceramic capacitors, opto-isolators, and module pwb
conductors, while controlling the ambient airflow rate and
temperature. For a given airflow and ambient temperature,
the module output power is increased, until one (or more) of
the components reaches its maximum derated operating
temperature, as defined in IPC-9592A. This procedure is then
repeated for a different airflow or ambient temperature until
a family of module output derating curves is obtained.
Please refer to the Application Note “Thermal
Characterization Process For Open-Frame Board-Mounted
Power Modules” for a detailed discussion of thermal aspects
including maximum device temperatures.
Figure 17. Thermal Test Setup .
Increased airflow over the module enhances the heat
transfer via convection. The thermal derating of figure 18-
21 shows the maximum output current that can be
delivered by each module in the indicated orientation
without exceeding the maximum TH
x
temperature versus
local ambient temperature (T
A
) for several air flow
conditions.
OUTPU
T CURRENT, I
O
(A)
LOCAL AMBIENT TEMPERATURE, T
A
(C)
Figure 18. Output Current Derating for the QBVS050A0Bxx-H
in the Transverse Orientation;
Airflow Direction from Vin(-) to Vin(+); Vin = 54V.
OUTPUT CURRE
NT, I
O
(A)
LOCAL AMBIENT TEMPERATURE, T
A
(C)
Figure 19. Output Current Derating for the QBVS050A0Bxx-H
+ 0.5” Heat Sink in the Transverse Orientation;
Airflow Direction from Vin(-) to Vin(+); Vin = 54V.
OUTPUT CURRE
NT, I
O
(A
)
LOCAL AMBIENT TEMPERATURE, T
A
(C)
Figure 20. Output Current Derating for the QBVS050A0Bxx-H
in the Longitudinal Orientation;
Airflow Direction from Vout to Vin; Vin = 54V.