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HPH Series
Isolated, Low V OUT to 70A, Half-Brick DC/DC Converters
Vertical Wind Tunnel
Murata Power Solutions employs a custom-designed enclosed
vertical wind tunnel, infrared video camera system and test
instrumentation for accurate air?ow and heat dissipation
analysis of power products. The system includes a precision low
IR Transparent
?ow-rate anemometer, variable speed fan, power supply input
optical window
Unit under
Variable
speed fan
and load controls, temperature gauges and adjustable heating
element.
IR Video
Camera
Precision
low-rate
anemometer
3” below UUT
Ambient
temperature
sensor
Air?ow
collimator
test (UUT)
Heating
element
The IR camera can watch thermal characteristics of the Unit
Under Test (UUT) with both dynamic loads and static steady-
state conditions. A special optical port is used which is transpar-
ent to infrared wavelengths. The computer ?les from the IR
camera can be studied for later analysis.
Both through-hole and surface mount converters are soldered
down to a host carrier board for realistic heat absorption and
spreading. Both longitudinal and transverse air?ow studies are
possible by rotation of this carrier board since there are often
signi?cant differences in the heat dissipation in the two air?ow
directions. The combination of both adjustable air?ow, adjustable
ambient heat and adjustable Input/Output currents and voltages
mean that a very wide range of measurement conditions can be
studied.
The air?ow collimator mixes the heat from the heating element
to make uniform temperature distribution. The collimator also
reduces the amount of turbulence adjacent to the UUT by restor-
ing laminar air?ow. Such turbulence can change the effective
heat transfer characteristics and give 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
Figure 10. Vertical Wind Tunnel
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.
Soldering Guidelines
Murata Power Solutions recommends the speci?cations below when installing these converters. These speci?cations vary depending on the solder type. Exceeding these speci?ca-
tions 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:
For Sn/Pb based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
115° C.
270° C.
7 seconds
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
105° C.
250° C.
6 seconds
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mans?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/
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. Speci?cations are subject to change without
notice.
? 2014 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_HPH_B01 Page 13 of 13
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