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參數(shù)資料
| 型號： | DW025BK-M |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 25 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 1627K |
| 代理商： | DW025BK-M |
Tyco Electronics Corp.
13
Data Sheet
June 1997
36 Vdc to 75 Vdc Input; Dual Outputs; 25 W
DW025 Dual Output-Series Power Modules: dc-dc Converters;
Thermal Considerations (continued)
Basic Thermal Performance
The DW025-Series Dual Output Power Modules have a
separate power stage for each of the outputs. This
means that the maximum operating temperature can
be predicted quite closely by treating each output indi-
vidually and then summing the results. Figures 16
through 21 are used to predict the safe operating con-
dition for many different operating and environmental
conditions.
The method used to determine the maximum ambient
temperature at a given air velocity is a four-step pro-
cess.
1. Find the power dissipated for output 1 by using the
ticular output condition (IO1).
2. Repeat step 1 for output 2 using Figures 16 through
3. Find the total power dissipated by summing the
power dissipated on each of the outputs:
(PDOUT1 + PDOUT2) = PDtotal
4. Use the total power dissipated with Figure 20 to
determine the maximum ambient temperature at dif-
ferent air velocities.
For example, the DW025AF-M power module operating
at full load on both outputs with 54 V input has a power
dissipation of 3.6 W (from Figure 17) plus 3.1 W (from
Figure 16) for a total of 6.7 W. Using Figure 20, it can
be determined that the maximum ambient temperature
at natural convection that the DW025AF-M can operate
at is approximately 56 °C.
Keep in mind that these are approximations of the tem-
peratures and airows required to keep the case tem-
perature below its maximum rating. The maximum case
temperature at the point shown in Figure 15 must be
kept at 100 °C or less.
Air Velocity
The air velocity required to maintain a desired maxi-
mum case temperature for a given power dissipation
and ambient temperature can be calculated using
Figure 21 and the following equation:
θCA =
where
θCA is the thermal resistance from case-to-ambi-
ent air (°C/W), TC, max is the desired maximum case
temperature (°C), TA is the ambient inlet temperature
(°C), and PDtotal is the total power dissipated from the
module (W).
For example, to maintain a maximum case temperature
of 85 °C with an ambient inlet temperature of 55 °C and
a power dissipation of 6.7 W, the thermal resistance is:
θCA ≤
= 4.5 °C/W
This corresponds to an air velocity greater than
TC max
,
TA
–
PDtotal
--------------------------------
85 °C
55 °C
–
6.7 W
------------------------------------
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