FL75L05A(2005) View Datasheet(PDF) - Delta Electronics, Inc.
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FL75L05A Datasheet PDF : 7 Pages
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THERMAL CONSIDERATIONS
Thermal management is an important part of the system
design. To ensure proper, reliable operation, sufficient
cooling of the power module is needed over the entire
temperature range of the module. Convection cooling is
usually the dominant mode of heat transfer.
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
Thermal Testing Setup
Delta’s filter modules are characterized in heated
vertical wind tunnels that simulate the thermal
environments encountered in most electronics
equipment. This type of equipment commonly uses
vertically mounted circuit cards in cabinet racks in which
the power modules are mounted.
The following figure shows the wind tunnel
characterization setup. The filter module is mounted on
a test PWB and is vertically positioned within the wind
tunnel. The space between the neighboring PWB and
the top of the power module is 6.35mm (0.25”).
Thermal Derating
Heat can be removed by increasing airflow over the
module. Figure 4 shows maximum output is a function of
ambient temperature and airflow rate. To enhance system
reliability, the power module should always be operated
below the maximum operating temperature. If the
temperature exceeds the maximum module temperature,
reliability of the unit may be affected.
FACING PWB
PWB
MODULE
THERMAL CURVES
GND
OUT
OUT
7mm
(0.275in)
Figure 5: Temperature measurement location
The allowed maximum hot spot temperature is defined at 120℃
FL75L05 (Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
6
@ Vin = 48V (Either orientation)
5
4
Natural
Convection
3
100LFM
2
1
0
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 6: Output Current vs. Ambient Temperature and Air
Velocity @ Vin = 48V (Either Orientation)
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
AIR FLOW
50.8 (2.0”)
10 (0.4”)
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 4: Wind tunnel test setup figure dimensions are in
millimeters and (inches).
3
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