QBDW033A0B41Z Datasheet, PDF (11/17 Pages) Lineage Power Corporation – QBDW033A0B Series Power Modules; DC-DC Converters

Advanced Data Sheet
February 10, 2011
QBDW033A0B Series Power Modules; DC-DC Converters
36-75V_dc Input; 9.6-12V_dc Output; 33A Output Current
Feature Descriptions (continued)
The output power of the module should not exceed the
rated power for the module as listed in the Ordering
Information table.
Although the maximum THx temperature of the power
modules is 110 °C - 125 °C, you can limit this temperature
to a lower value for extremely high reliability.
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.
Heat Transfer via Convection
Increased airflow over the module enhances the heat
transfer via convection. The thermal derating of figure 16
shows the maximum output current that can be delivered by
each module in the indicated orientation without exceeding
the maximum THx temperature versus local ambient
temperature (TA) for air flows of, Natural Convection, 1 m/s
(200 ft./min), 2 m/s (400 ft./min).
The use of Figures 16 is shown in the following example:
Example
What is the minimum airflow necessary for a
QBDW033A0B operating at VI = 48 V, an output current of
22A, and a maximum ambient temperature of 70 °C in
transverse orientation.
Solution:
Given: Vin= 48V, IO = 22A, TA = 70 °C
Determine required airflow (V) (Use Figure 16):
V = tbd or greater.
LOCAL AMBIENT TEMPERATURE, TA (C)
Figure 16. Output Current Derating for the Open
Frame QBDW033A0B in the Transverse Orientation;
Airflow Direction from Vin(+) to Vin(-); Vin = 48V.
LINEAGE POWER
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