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參數(shù)資料
| 型號： | CW025AJ-M |
| 廠商： | LINEAGE POWER LLC |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 13.125 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | MODULE-7 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大小： | 559K |
| 代理商： | CW025AJ-M |
12
Lineage Power
Data Sheet
April 2008
36 Vdc to 75 Vdc Input; 25 W
CW025 Dual Output-Series Power Modules:
Thermal Considerations (continued)
Basic Thermal Performance (continued)
For example, the CW025AJ-M power module with a
54 V input and 2.5 A output on VO1 and a 1.5 A output
on VO2 will have a power dissipated of 3.6 W (from
Figure 16) plus 2.1 W (from Figure 16) or 5.7 W total.
Using Figure 19, it can be determined that the maxi-
mum ambient temperature at natural convection that
the CW025AJ-M can operate at is approximately
62 °C.
Keep in mind that these are approximations of the air
temperature and velocity required to keep the case
temperature 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 by using
Figure 19 and the following equation:
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:
This corresponds to an air velocity greater than
0.46 ms–1 (90 fpm) in Figure 19.
8-987a(C)
Figure 16. 5 V Output Power Dissipation vs. Output
Current
8-1000(C)
Figure 17. 12 V Output Power Dissipation vs.
Output Current
θCA
TC max
,
TA
–
PDtotal
---------------------------------
=
θCA 85 °C55 °C
–
6.7 W
----------------------------------
≤
4.5
°C W
=
0
0.5
1.0
1.5
2.0
2.5
0
0.5
1.0
1.5
2.0
4.0
OUTPUT CURRENT, IO (A)
2.5
3.0
3.5
POWER
DISSIPATION,
P
D
(W)
VI = 54 V
VI = 72 V
VI = 36 V
0.0
0.2
0.4
0.6
0.8
1.2
0.0
0.5
1.0
1.5
2.0
3.0
OUTPUT CURRENT, IO (A)
2.5
VI = 36 V
VI = 54 V
VI = 72 V
1.0
POWER
DISSIPATION,
P
D
(W)
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