TWR A-Series
12-15W, Triple Output DC-DC Converters
TWR-5/1500-15/250-D48A Radiated Emissions
FCC Part 15 Class B 3 Meters
Converter Output = +5Vdc @ 1.35A and 15Vdc @ 225mA
5
6
7
+12/15V
+5V
80
70
60
50
40
30
20
10
0
+
+
C
OUT
1
2
+INPUT
–INPUT
+
FCC Class B Limit
+
COUT
CIN
COMMON
COUT
8
–12/15V
Radiated Emissions
Figure 2. Using External Capacitors
to Reduce Input/Output Ripple/Noise
–10
–20
100
1000
Frequency (MHz)
Input Fusing
Certain applications andꢀor safety agencies may require the installation of
fuses at the inputs of power conversion components. For Murata Power
Solutions A-Series TWR 12-15 Watt DC-DC Converters, you should use
slow-blow type fuses with values no greater than 2A.
TWR-5/1500-15/250-D48A Radiated Emissions
EN55022 Class B 10 Meters
Converter Output = +5Vdc @ 1.35A and 15Vdc @ 225mA
80
70
60
50
40
30
20
10
0
C U S T O M C A P A B I L I T I E S
Murata Power Solutions’ world-class design, development and manu-
facturing 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!
EN 55022 Class B Limit
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.
Radiated Emissions
–10
–20
100
1000
We have compiled a large library of DC-DC designs that are currently used
in a variety of telecom, medical, computer, railway, aerospace and indus-
trial applications. We may already have the converter you need.
Frequency (MHz)
Quality and Reliability
Contact us. Our goal is to provide you the highest-quality, most cost-
effective power converters available.
The A-Series are the first DC-DC Converters to emerge from Murata Power
Solutions’ new, company-wide approach to designing and manufacturing
the most reliable power converters available. The five-pronged program
draws our Quality Assurance function into all aspects of new-product
design, development, characterization, qualification and manufacturing.
E M I R A D I A T E D E M I S S I O N S
If you’re designing with EMC in mind, please note that all of Murata Power
Solutions’ TWR A-Series 12-15 Watt DC-DC Converters have been charac-
terized for radiated and conducted emissions in our new EMIꢀEMC labora-
tory. Testing is conducted in an EMCO 53ꢁ5 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 55ꢁ22), Class B. Correlation to
other specifications can be supplied upon request. Radiated emissions
plots to FCC and CISPR 22 for model TWR-5ꢀ15ꢁꢁ-15ꢀ25ꢁ-D48A appear
below. Published EMC test reports are available for each model number.
Contact Murata Power Solutions’ Applications Engineering Department for
more details.
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 componentsꢀvendors list ensuring the use of
reliable components and the rigorous qualification 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
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