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| 型号： | L48DB12001PSA |
| 元件分类： | 电源模块 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封装： | QUARTER BRICK PACKAGE-7 |
| 文件页数： | 3/13页 |
| 文件大小： | 407K |
| 代理商： | L48DB12001PSA |
DS_ L48DB12001 _02102009
11
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’’).
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.
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 19:
Wind Tunnel Test Setup
THERMAL CURVES
Figure 20:
Temperature measurement location
* The allowed maximum hot spot temperature is defined at 119℃
L48DB12001(Standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin = 48V (Either Orientation)
0.00
0.25
0.50
0.75
1.00
1.25
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Output Current(A)
Natural
Convection
Figure 21:
Output current vs. ambient temperature and air velocity
@Vin = 48V(Either Orientation)
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