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BWR-15/500-D5A-C

P1-P3P4-P6
Figure 3a. Trim Connections Using a Trimpot
Figure 2. Using External Capacitors to Reduce
Input/Output Ripple/Noise
20k
5-10
Turns
5
7
6
LOAD
LOAD
8
+INPUT
–INPUT
TRIM
COMMON
–OUTPUT
+OUTPUT
1
2
+INPUT
–INPUT
+OUTPUT
TRIM
1
2
5
7
8
LOAD
LOAD
COMMON
6
–OUTPUT
Figure 3b. Fixed-Value Trim Down Resistor
+INPUT
–INPUT
+OUTPUT
TRIM
1
2
5
7
8
LOAD
LOAD
COMMON
6
–OUTPUT
Figure 3c. Fixed-Value Trim Up Resistor
–OUTPUT
+INPUT
–INPUT
+OUTPUT
1
2
5
7
COMMON
6
C
IN
C
OUT
C
OUT
+
+
+
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. For MPS A-Series
BWR 15-20 Watt DC/DC Converters, you should use slow-blow type fuses
with values no greater than the following:
V
IN Range Fuse Value
D5A 6A
D12A 4A
D48A 2A
On/Off Control
The On/Off Control pin (pin 4) may be used for remote on/off operation. A
TTL logic high (+2 to +5 Volts, 250µA max.) applied to pin 4 disables the
converter. A TTL logic low (0 to +0.8 Volts, 70µA max.), or no connection,
enables the converter. Control voltages should be referenced to pin 2
(–Input). Applying a voltage to the Control pin when no input power is applied
to the converter can cause permanent damage to the converter.
Output Trimming
The total output voltage span, from +Output (pin 5) to –Output (pin 7) may
be trimmed ±5% via a single external trimpot or fi xed resistor. The trimpot
should be connected as shown in Figure 3a with its wiper connected to pin 8
(Trim). A trimpot can be used to determine the value of a single fi xed resistor
which should be connected as shown in Figures 3b and 3c. Connect the
resistor between pin 8 (Trim) and pin 5 (+Output) to trim "down" the output
voltages. Connect the resistor between pins 8 and 7 (–Output) to trim "up"
the output voltages. Fixed resistors should be metal-fi lm types with absolute
TCR’s less than 100ppm/°C to ensure stability.
BWR Models
15-20W, Dual Output DC/DC Converters
MDC_BWR15_20.D01 Page 4 of 6
www.murata-ps.com/support
If you’re designing with EMC in mind, please note that all of MPS’s BWR
15-20 Watt A-Series DC/DC Converters have been characterized for radi-
ated and conducted emissions in our new EMI/EMC laboratory. Testing is
conducted in an EMCO 5305 GTEM test cell utilizing EMCO automated EMC
test software. Radiated emissions are tested to the limits of FCC Part 15,
Class B and CISPR 22 (EN 55022), Class B. Radiated emissions plots to
FCC and CISPR 22 for model BWR-5/1700-D48A appear below.
BWR-5/1700-D48A Radiated Emissions
EN 55022 Class B, 10 Meters
Converter Output = ±5Vdc @ ±1.6A
80
70
60
50
40
30
20
10
0
–10
–20
Frequency (MHz)
100
1000
Radiated Emissions
EN 55022 Class B Limit
Radiated Emissions (dBµV/M)
80
70
60
50
40
30
20
10
0
–10
–20
Frequency (MHz)
100
1000
FCC Class B Limit
BWR-5/1700-D48A Radiated Emissions
FCC Part 15 Class B, 3 Meters
Converter Output = ±5Vdc @ ±1.6A
Radiated Emissions (dBµV/M)
Radiated Emissions
MPS’s world-class design, development and manufacturing team stands
ready to work with you to deliver the exact power converter you need for
your demanding, large volume, OEM applications. And ... we’ll do it on time
and within budget!
Our experienced applications and design staffs; quick-turn prototype
capability; highly automated, SMT assembly facilities; and in-line SPC
quality-control techniques combine to give us the unique ability to design
and deliver any quantity of power converters to the highest standards of
quality and reliability.
We have compiled a large library of DC/DC designs that are currently used
in a variety of telecom, medical, computer, railway, aerospace and industrial
applications. We may already have the converter you need.
Contact us. Our goal is to provide you the highest-quality, most cost-effec-
tive power converters available.
CUSTOM CAPABILITIES
EMI RADIATED EMISSIONS
Quality and Reliability
The A-Series are the fi rst DC/DC Converters to emerge from MPS’s new,
company-wide approach to designing and manufacturing the most reliable
power converters available. The fi ve-pronged program draws our Quality
Assurance function into all aspects of new-product design, development,
characterization, qualifi cation and manufacturing.
Design for Reliability
Design for Reliability is woven throughout our multi-phased, new-product-
development process. Design-for-reliability practices are fully documented
and begin early in the new-product development cycle with the following
goals:
1. To work from an approved components/vendors list ensuring the use of
reliable components and the rigorous qualifi cation of new components.
2. To design with safety margins by adhering to a strict set of derating
guidelines and performing theoretical worst-case analyses.
3. To locate potential design weaknesses early in the product-development
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.
HALT Testing
The goal of the accelerated-stress techniques used by MPS 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
that could result in possible future fi eld failures.
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-specifi c stresses (such
as dc voltage variation) and combined environments. The stresses are not
meant to simulate fi eld environments but to expose any weaknesses in a
product’s electro/mechanical design and/or 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 continually stepped
up until products eventually fail. After corrective actions and/or design
changes, stresses are stepped up again and the cycle is repeated until the
"fundamental limit of the technology" is determined.
BWR Models
15-20W, Dual Output DC/DC Converters
MDC_BWR15_20.D01 Page 5 of 6
www.murata-ps.com/support
Soldering Guidelines
Murata Power Solutions recommends the specifi cations below when
installing these converters. These specifi cations vary depending on the
solder type. Exceeding these specifi cations may cause damage to the
product. Be cautious when there is high atmospheric humidity. We strongly
recommend a mild pre-bake (100° C. for 30 minutes). Your production en-
vironment 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
MPS 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 profi le (shown above) consists of thermal
cycling (–55 to +125°C, 30°C/minute) and simultaneous, gradually increas-
ing, random longitudinal and rotational vibration up to 20G’s with load cycling
and applied-voltage extremes added as desired. Many devices in MPS’s new
A-Series could not be made to 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.
Qualifi cation
For each new product, electrical performance is verifi ed via a comprehensive
characterization process and long-term reliability is confi rmed via a rigorous
qualifi cation procedure. The qual procedure includes such strenuous tests as
thermal shock and 500 hour life. Qual testing is summarized below.
In-Line Process Controls and Screening
A combination of statistical sampling and 100% inspection techniques keeps
our assembly line under constant control. Parameters such as solder-paste
thickness, component placement, cleanliness, etc. are statistically sampled,
charted and fi ne tuned as necessary. Visual inspections are performed by
trained operators after pick-and-place, soldering and cleaning operations.
Units are 100% electrically tested prior to potting. All devices are temperature
cycled, burned-in, hi-pot tested and fi nal-electrical tested prior to external
visual examination, packing and shipping.
Rapid Response to Problems
MPS employs an outstanding corrective-action system to immediately
address any detected shortcomings in either products or processes. When-
ever our assembly, quality or engineering personnel spot a product/process
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 refi ne our assembly operation to
yield one of the lowest product defect rates in the industry.
Typical HALT Profi le
Qualifi cation Test Method/Comments
HALT MPS in-house procedure
High Temperature Storage Max. rated temp., 1,000 hours
Thermal Shock 10 cycles, –55 to +125°C
Temperature/Humidity +85°C, 85% humidity, 48 hours
Lead Integrity MPS in-house procedure
Life Test +70°C, 500 hours*
Marking Permanency MPS in-house procedure
End Point Electrical Tests Per product specifi cation
Qualifi cation Testing
* Interim electrical test at 200 hours.
10 20 30 40 50 60 70 80 90
40
20
0
Random Vibration
(
G's
)
Temperature (°C)
Test Time (minutes)
100
80
60
40
20
0
–20
–40
BWR Models
15-20W, Dual Output DC/DC Converters
MDC_BWR15_20.D01 Page 6 of 6
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. © 2014 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/
P1-P3P4-P6

BWR-15/500-D5A-C

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