JW100G Lineage Power, JW100G Datasheet - Page 14

• Manufacturer Part Number: JW100G
• Manufacturer: Lineage Power

JW100G and JW150G Power Modules; dc-dc Converters:
36 Vdc to 75 Vdc Input, 2.5 Vdc Output; 50 W to 75 W
Thermal Considerations
Custom Heat Sinks
A more detailed model can be used to determine the
required thermal resistance of a heat sink to provide
necessary cooling. The total module resistance can be
separated into a resistance from case-to-sink (θcs) and
sink-to-ambient (θsa) shown below (Figure 27).
Figure 27. Resistance from Case-to-Sink and
For a managed interface using thermal grease or foils,
a value of θcs = 0.1 °C/W to 0.3 °C/W is typical. The
solution for heat sink resistance is:
14
14
θ
sa
=
P
D
Sink-to-Ambient
(
------------------------ -
T
C
P
T
–
C
D
T
A
)
–
θ
θ
cs
cs
T
S
(continued)
θ
sa
T
A
8-1304 (F).e
This equation assumes that all dissipated power must
be shed by the heat sink. Depending on the user-
defined application environment, a more accurate
model, including heat transfer from the sides and bot-
tom of the module, can be used. This equation pro-
vides a conservative estimate for such instances.
EMC Considerations
For assistance with designing for EMC compliance,
please refer to the FLTR100V10 Filter Module Data
Sheet (DS99-294EPS).
Layout Considerations
Copper paths must not be routed beneath the power
module mounting inserts. For additional layout guide-
lines, refer to the FLTR100V10 Filter Module Data
Sheet (DS99-294EPS).
Lineage Power
March 2008
Data Sheet