Datasheet

PAH-28 Vout, 350-Watt Series
Isolated, 350-Watt, Half-Brick DC-DC Converters
MDC_PAH-28Vout-350W.B05 Page 21 of 21
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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/
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 system, and test instru-
mentation for accurate airfl ow and heat dissipation 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 car-
rier 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.
Figure 11. Vertical Wind Tunnel