TWR A-Series
12-15W, Triple Output DC-DC Converters
fail prior to reaching either the limits of the HALT chamber or some previously
known physical limit of the device. We also use the HALT chamber and its ability
to rapidly cool devices to verify their "cold-start" capabilities.
cycle by using extensive HALT (Highly Accelerated Life Testing).
4. To prove that early design improvements are effective by employing a
thorough FRACA (Failure Reporting Analysis and Corrective Action) system.
Qualification
HALT Testing
For each new product, electrical performance is verified via a comprehensive
characterization process and long-term reliability is confirmed via a rigorous
qualification procedure. The qual procedure includes such strenuous tests as
thermal shock and 5ꢁꢁ hour life. Qual testing is summarized below.
The goal of the accelerated-stress techniques used by Murata Power
Solutions is to force device maturity, in a short period of time, by exposing
devices to excessive levels of "every stimulus of potential value." We use
HALT (Highly Accelerated Life Testing) repeatedly during the design and
early manufacturing phases to detect potential electrical and mechanical
design weaknesses
Qualification Testing
Qualification Test
HALT
Method/Comments
that could result in possible future field failures.
Murata Power Solutions in-house procedure
Max. rated temp., 1,000 hours
10 cycles, –55 to +125°C
During HALT, prototype and pre-production DC-DC converters are subjected
to progressively higher stress levels induced by thermal cycling, rate of
temperature change, vibration, power cycling, product-specific stresses
(such as dc voltage variation) and combined environments. The stresses are
not meant to simulate field environments but to expose any weaknesses
in a product’s electroꢀmechanical design andꢀor assembly processes. The
goal of HALT is to make products fail so that device weaknesses can be
analyzed and strengthened as appropriate. Applied stresses are continu-
ally stepped up until products eventually fail. After corrective actions andꢀ
or design changes, stresses are stepped up again and the cycle is repeated
until the "fundamental limit of the technology" is determined.
High Temperature Storage
Thermal Shock
Temperature/Humidity
Lead Integrity
+85°C, 85% humidity, 48 hours
Murata Power Solutions in-house procedure
+70°C, 500 hours*
Life Test
Marking Permanency
End Point Electrical Tests
Murata Power Solutions in-house procedure
Per product specification
* Interim electrical test at 200 hours.
In-Line Process Controls and Screening
A combination of statistical sampling and 1ꢁꢁ% inspection techniques
keeps
Typical HALT Profile
100
our assembly line under constant control. Parameters such as solder-paste
thickness, component placement, cleanliness, etc. are statistically sampled,
charted and fine tuned as necessary. Visual inspections are performed by
trained operators after pick-and-place, soldering and cleaning operations.
Units are 1ꢁꢁ% electrically tested prior to potting. All devices are tem-
perature cycled, burned-in, hi-pot tested and final-electrical tested prior to
external visual examination, packing and shipping.
80
60
40
20
0
40
20
0
–20
–40
Rapid Response to Problems
Murata Power Solutions employs an outstanding corrective-action system
to immediately address any detected shortcomings in either products or
processes. Whenever our assembly, quality or engineering personnel spot
a productꢀprocess problem, or if a product is returned with a potential
defect, we immediately perform a detailed failure analysis and, if necessary,
undertake corrective actions. Over time, this system has helped refine our
assembly operation to yield one of the lowest product defect rates in the
industry.
10
20
30
40
50
60
70
80
90
Test Time (minutes)
Murata Power Solutions has invested in a Qualmark OVS-1 HALT tester
capable of applying voltage and temperature extremes as well as 6-axis,
linear and rotational, random vibration. A typical HALT profile (shown above)
consists of thermal cycling (–55 to +125°C, 3ꢁ°Cꢀminute) and simultane-
ous, gradually increasing, random longitudinal and rotational vibration up
to 2ꢁG’s with load cycling and applied-voltage extremes added as desired.
Many devices in Murata Power Solutions’ A-Series could not be made to
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.
11 Cabot Boulevard, Mansfield, MA ꢁ2ꢁ48-1151 U.S.A.
ISO 9ꢁꢁ1 and 14ꢁꢁ1 REGISTERED
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. Specifications are subject to change without
notice.
© 2015 Murata Power Solutions, Inc.
www.murata-ps.com/support
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