Datasheet

www.murata-ps.com/support
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without
notice. © 2016 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
ULT Series
Thirty-Second-Brick Isolated DC/DC Converters
with 2:1 Wide Input Range
MDC_ULT Series.F05 Page 26 of 26
Figure 9. Vertical Wind Tunnel
Through-hole Soldering Guidelines
Murata Power Solutions recommends the TH soldering specifi cations below when install-
ing these converters. These specifi cations vary depending on the solder type. Exceeding
these specifi cations may cause damage to the product. Your production environment may
differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature 115° C.
Maximum Pot Temperature 270° C.
Maximum Solder Dwell Time 7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature 105° C.
Maximum Pot Temperature 250° C.
Maximum Solder Dwell Time 6 seconds
SMT Refl ow Soldering Guidelines
The surface-mount refl ow solder profi le shown below is suitable for SAC305 type lead-
free solders. This graph should be used only as a guideline. Many other factors infl uence
the success of SMT refl ow soldering. Since your production environment may differ,
please thoroughly review these guidelines with your process engineers.
IR Video
Camera
IR Transparent
optical window
Variable
speed fan
Heating
element
Ambient
temperature
sensor
Airflow
collimator
Precision
low-rate
anemometer
3” below UUT
Unit under
test (UUT)
Vertical Wind Tunnel
Murata Power Solutions employs a computer controlled custom-
designed closed loop vertical wind tunnel, infrared video camera sys-
tem, and test instrumentation for accurate airfl ow and heat dissipa-
tion analysis of power products. The system includes a precision low
fl ow-rate anemometer, variable speed fan, power supply input and
load controls, temperature gauges, and adjustable heating element.
The IR camera monitors the thermal performance of the Unit Under
Test (UUT) under static steady-state conditions. A special optical port
is used which is transparent to infrared wavelengths.
Both through-hole and surface mount converters are soldered
down to a 10" x 10" host carrier board for realistic heat absorption
and spreading. Both longitudinal and transverse airfl ow studies are
possible by rotation of this carrier board since there are often signifi -
cant differences in the heat dissipation in the two airfl ow directions.
The combination of adjustable airfl ow, adjustable ambient heat, and
adjustable Input/Output currents and voltages mean that a very wide
range of measurement conditions can be studied.
The collimator reduces the amount of turbulence adjacent to the
UUT by minimizing airfl ow turbulence. Such turbulence infl uences the
effective heat transfer characteristics and gives false readings. Excess
turbulence removes more heat from some surfaces and less heat
from others, possibly causing uneven overheating.
Both sides of the UUT are studied since there are different thermal
gradients on each side. The adjustable heating element and fan, built-in
temperature gauges, and no-contact IR camera mean that power supplies
are tested in real-world conditions.