BWR-5/1700-D48A Radiated Emissions
EN 55022 Class B, 10 Meters
C U S T O M C A P A B I L I T I E S
Converter Output = 5Vdc @ 1.6A
C&D’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!
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10
0
Our experienced applications and design staffs; quick-turn prototype capa-
bility; 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.
EN 55022 Class B Limit
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.
Radiated Emissions
–10
–20
100
1000
Contact us. Our goal is to provide you the highest-quality, most cost-effective
Frequency (MHz)
E M I R A D I A T E D E M I S S I O N S
Quality and Reliability
If you’re designing with EMC in mind, please note that all of C&D’s BWR
ꢀ±-25 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 ±35± GTEM test cell utilizing EMCO automated EMC
test software. Radiated emissions are tested to the limits of FCC Part ꢀ±,
Class B and CISPR 22 (EN ±±522), Class B. Correlation to other specifica-
tions can be supplied upon request. Radiated emissions plots to FCC and
CISPR 22 for model BWR-±/ꢀ755-D48A appear below. Published EMC test
reports are available for each model number. Contact C&D’s Applications
Engineering Department for more details.
The A-Series are the first DC/DC Converters to emerge from C&D’s 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.
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:
ꢀ. To work from an approved components/vendors 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.
BWR-5/1700-D48A Radiated Emissions
FCC Part 15 Class B, 3 Meters
Converter Output = 5Vdc @ 1.6A
80
70
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.
60
FCC Class B Limit
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20
10
HALT Testing
The goal of the accelerated-stress techniques used by C&D 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
0
Radiated Emissions
–10
–20
100
1000
that could result in possible future field failures.
Frequency (MHz)
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 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.
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