TWR-5/3000-15/500-D48A-C【PDF 7/8 页】CONV DC/DC TRI OUT 5,15,-15V

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TWR A-Series

20W, Triple Output DC-DC Converters

Quality and Reliability

The A-Series are the ?rst DC/DC Converters to emerge from MPS’s new,

company-wide approach to designing and manufacturing the most reliable

power converters available. The ?ve-pronged program draws our Quality

Assurance function into all aspects of new-product design, development,

characterization, quali?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 quali?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

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.

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 pro?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 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.

Quali?cation

For each new product, electrical performance is veri?ed via a comprehen-

sive characterization process and long-term reliability is con?rmed via a

rigorous quali?cation procedure. The qual procedure includes such strenu-

ous tests as thermal shock and 500 hour life. Qual testing is summarized

below.

Quali?cation Testing

device maturity, in a short period of time, by exposing devices to excessive

levels of “every stimulus of potential value.” We use HALT (Highly Acceler-

ated Life Testing) repeatedly during the design and early manufacturing

phases to detect potential electrical and mechanical design weaknesses

that could result in possible future ?eld failures.

During HALT, prototype and pre-production DC/DC converters are sub-

jected to progressively higher stress levels induced by thermal cycling,

rate of temperature change, vibration, power cycling, product-speci?c

stresses (such as dc voltage variation) and combined environments. The

stresses are not meant to simulate ?eld environments but to expose any

weaknesses in a product’s electro/mechanical design and/or assem-

Quali?cation Test

HALT

High Temperature Storage

Thermal Shock

Temperature/Humidity

Lead Integrity

Life Test

Marking Permanency

End Point Electrical Tests

* Interim electrical test at 200 hours.

Method/Comments

MPS in-house procedure

Max. rated temp., 1,000 hours

10 cycles, –55 to +125°C

+85°C, 85% humidity, 48 hours

MPS in-house procedure

+70°C, 500 hours*

MPS in-house procedure

Per product speci?cation

bly processes. The goal of HALT is to make products fail so that device

weaknesses can be analyzed and strengthened as appropriate. Applied

In-Line Process Controls and Screening

A combination of statistical sampling and 100% inspection techniques

100

80

60

40

Typical HALT Pro?le

40

20

keeps our assembly line under constant control. Parameters such as

solder-paste thickness, component placement, cleanliness, etc. are statisti-

cally sampled, charted and ?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 ?nal-electrical tested

prior to external visual examination, packing and shipping.

20

0

–20

0

Rapid Response to Problems

MPS employs an outstanding corrective-action system to immediately

address any detected shortcomings in either products or processes. When-

–40

10

20

30

40 50

Test Ti me (minutes)

60

70

80

90

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 re?ne our assembly operation to

yield one of the lowest product defect rates in the industry.

www.murata-ps.com/support

MDC_TWR20W.E02 Page 7 of 8

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