JW075C Lineage Power, JW075C Datasheet - Page 14

• Manufacturer Part Number: JW075C
• Manufacturer: Lineage Power

dc-dc Converters; 36 to 75 Vdc Input, 15 Vdc Output; 50 W to 150 W
Thermal Considerations
Heat Transfer Without Heat Sinks
Figure 29. JW075C Power Dissipation vs.
Figure 30. JW100C Power Dissipation vs.
14
14
16
15
14
13
12
11
10
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
0.0
0
Output Current
Output Current
0.5
1
V
V
V
1.0
I
I
I
= 72 V
= 54 V
= 36 V
V
V
V
1.5
OUTPUT CURRENT, I
OUTPUT CURRENT, I
2
I
I
I
= 72 V
= 36 V
= 54 V
2.0
3
2.5
3.0
4
(continued)
O
3.5
(A)
O
(A)
5
4.0
4.5
(continued)
6
5.0
8-1442 (C)
8-1443 (C)
7
Figure 31. JW150C Power Dissipation vs.
Heat Transfer with Heat Sinks
The power modules have through-threaded, M3 x 0.5
mounting holes, which enable heat sinks or cold plates
to attach to the module. The mounting torque must not
exceed 0.56 N-m (5 in.-lb.). For a screw attachment
from the pin side, the recommended hole size on the
customer’s PWB around the mounting hole is
0.130 ± 0.005 inches. If a larger hole is used, the
mounting torque from the pin side must not exceed
0.25 N-m (2.2 in.-lb.).
Thermal derating with heat sinks is expressed by using
the overall thermal resistance of the module. Total
module thermal resistance (θca) is defined as the max-
imum case temperature rise (ΔT
module power dissipation (P
The location to measure case temperature (T
shown in Figure 26. Case-to-ambient thermal resis-
tance vs. airflow is shown, for various heat sink config-
urations and heights, in Figure 32. These curves were
obtained by experimental testing of heat sinks, which
are offered in the product catalog.
θ
ca
25
20
15
10
5
0
0
=
Output Current
ΔT
-------------------- -
1
P
C max
,
2
D
OUTPUT CURRENT, I
3
V
V
V
I
I
I
=
= 72 V
= 36 V
= 54 V
4
(
----------------------- -
T
D
C
5
):
P
–
D
C, max
T
6
A
)
O
(A)
7
) divided by the
Lineage Power
8
April 2008
9
C
) is
10
8-1444 (C)