JW075B5 Lineage Power, JW075B5 Datasheet - Page 12

• Manufacturer Part Number: JW075B5
• Manufacturer: Lineage Power

JW075A5, JW075B5, JW075C5 Power Modules: dc-dc Converters:
Thermal Considerations
Heat Transfer Without Heat Sinks
Figure 22. JW075A5 Power Dissipation vs.
Figure 23. JW075B5 Power Dissipation vs.
12
12
36 Vdc to 75 Vdc Input; 5 Vdc, 12 Vdc, or 15 Vdc Output; 75 W
16
15
14
13
12
11
10
17
16
15
14
13
12
11
10
9
8
7
6
5
4
9
8
7
6
5
0
0
1
Output Current
Output Current
2
1
3
4
OUTPUT CURRENT, I
OUTPUT CURRENT, I
2
5
6
7
3
8
(continued)
9
4
10
O
O
(A)
(A)
11
V
V
V
(continued)
12
I
I
I
5
V
V
V
= 75 V
= 54 V
= 36 V
I
I
I
= 75 V
= 54 V
= 36 V
13
8-1526 (C)
8-1527 (C)
14
6
15
Figure 24. JW075C5 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 holes 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 mod-
ule thermal resistance ( ca) is defined as the maximum
case temperature rise ( T
power dissipation (P
The location to measure case temperature (T
shown in Figure 20. Case-to-ambient thermal resis-
tance vs. airflow is shown, for various heat sink config-
urations and heights, in Figure 25. These curves were
obtained by experimental testing of heat sinks, which
are offered in the product catalog.
16
15
14
13
12
11
10
9
8
7
6
ca
0.0
=
0.5
Output Current
-------------------- -
T
1.0
P
C max
,
D
OUTPUT CURRENT, I
1.5
D
):
=
2.0
C, max
----------------------- -
T
C
2.5
P
–
) divided by the module
D
T
A
3.0
O
(A)
3.5
Data Sheet
April 2008
4.0
V
V
V
Lineage Power
I
I
I
C
= 36 V
= 54 V
= 75 V
) is
4.5
8-1528 (C)
5.0