Data Sheet
JNW350R Power Modules; DC-DC Converters
36 – 75 Vdc Input; 28Vdc Output; 350W Output
July 27, 2009
Thermal Considerations (continued)
Layout Considerations
The JNW350R power module series are aluminum
base board packaged style, as such; component
clearance between the bottom of the power module
and the mounting (Host) board is limited. Avoid
placing copper areas on the outer layer directly
underneath the power module.
375
350
325
300
275
250
Post Solder Cleaning and Drying
Considerations
Post solder cleaning is usually the final circuit-board
assembly process prior to electrical board testing. The
20
30
40
50
60
70
80
90 100
result of inadequate cleaning and drying can affect
both the reliability of a power module and the
testability of the finished circuit-board assembly. For
guidance on appropriate soldering, cleaning and
drying procedures, refer to Lineage Power Board
Mounted Power Modules: Soldering and Cleaning
Application Note.
Baseplate Temperature (C)
Figure 20. Output Power Derating for JNW350R in
Conduction cooling (cold plate) applications;
Ta <70ºC in vicinity of module interior; VIN = VIN,
Through-Hole Lead-Free Soldering
Information
The RoHS-compliant through-hole products use the
SAC (Sn/Ag/Cu) Pb-free solder and RoHS-compliant
components. They are designed to be processed
through single or dual wave soldering machines. The
pins have an RoHS-compliant finish that is compatible
with both Pb and Pb-free wave soldering processes.
A maximum preheat rate of 3°C/s is suggested. The
wave preheat process should be such that the
temperature of the power module board is kept below
210°C. For Pb solder, the recommended pot
temperature is 260°C, while the Pb-free solder pot is
270°C max. Not all RoHS-compliant through-hole
products can be processed with paste-through-hole
Pb or Pb-free reflow process. If additional information
is needed, please consult with your Lineage Power
representative for more details
Figure 21. Derating Output Current vs. local
Ambient temperature and Airflow, No Heatsink,
Vin=48V.
Figure 22. Derating Output Current vs. local
Ambient temperature and Airflow, 1” Heatsink,
Vin=48V.
LINEAGE POWER
12
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
