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| 型号： | D48S1238-2D |
| 元件分类： | 电源模块 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, MODULE-7 |
| 文件页数： | 12/13页 |
| 文件大小： | 476K |
| 代理商： | D48S1238-2D |
DS_D48S1238-2_04142009
8
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 DC/DC power 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 power 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 constantly kept at
6.35mm (0.25’’).
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
12.7 (0.5”)
MODULE
AIR FLOW
50.8 (2.0”)
FACING PWB
PWB
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
Figure 12:
Wind tunnel test setup
Thermal Derating
Heat can be removed by increasing airflow over the
module. 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.
THERMAL CURVES
Figure 13:
Temperature measurement location (open frame)
* The allowed maximum hot spot temperature is defined at 110℃.
Input
Output
Figure 14:
Temperature measurement location (with heatspreader)
* The allowed maximum hot spot temperature is defined at 90℃.
D48S1238-2 Output Current vs. Ambient Temperature and Air Velocity
@ Vin =48V, Open Frame(Transverse Orientation)
0
5
10
15
20
25
30
35
40
25
35
45
55
65
75
85
Ambient Temperature (℃)
Output Current (A)
500LFM
200LFM
600LFM
100LFM
300LFM
400LFM
Figure 15:
Output current vs. ambient temperature and air velocity@
Vin=48V (Open frame, Transverse orientation)
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