LW016AJ Lineage Power, LW016AJ Datasheet - Page 11

• Manufacturer Part Number: LW016AJ
• Manufacturer: Lineage Power

April 2008
Thermal Considerations
Heat Transfer
Example
What is the minimum airflow necessary for a LW016AJ
operating at V
each output, and a maximum ambient temperature of
80 °C?
Solution
Given: V
Determine P
Determine airflow (Figure 12): v = 0.5 ms
(100 ft./min.)
Figure 12. Forced Convection Power Derating;
Lineage Power
Note: Conversion factor for linear feet per minute to meters per
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
second: 200 ft./min. = 1 ms
30
I
= 75 V, I
Either Orientation
NATURAL CONVECTION
D
I
40
(Figure 13): P
MAX AMBIENT TEMPERATURE, T
= 75 V, an output current of 0.8 A on
1.0 ms
0.5 ms
1.5 ms
2.0 ms
O1
(continued)
50
= I
-1
-1
-1
-1
(100 ft./min.)
(200 ft./min.)
(300 ft./min.)
O2
(400 ft./min.)
= 0.8 A, T
60
–1
D
.
= 2.8 W
70
(continued)
A
= 80 °C
80
–1
A
(˚C)
90
8-1282(C).b
100
Figure 13. LW016AJ Power Dissipation vs. Output
Figure 14. LW016BK Power Dissipation vs. Output
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0.0
0.0
Current, T
Current, T
36 Vdc to 75 Vdc Inputs; 16 W
OUTPUT CURRENT, I
0.17
OUTPUT CURRENT, I
0.4
A
A
= 25 °C
= 25 °C
0.34
0.8
O1
O1
= I
= I
O2
V
V
V
O2
V
V
V
I
I
I
0.51
I
I
I
(A)
= 75 V
= 48 V
= 36 V
= 75 V
= 48 V
= 36 V
1.2
(A)
8-1341(C).e
8-1341(C).f
0.67
1.6
11