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Designing
a NEBS-compliant Power System -
SMH4804
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Pre-Testing
for NEBS Compliance,
Cont'd
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The
Level 2 (+/-1000 Volts) surge waveform is then
applied to the board. The scope photo (Figure 11)
indicates the protection circuit is clamping the
surge to a very safe -80 Volts.
The last test is the ESD test. Starting at the
lowest level of protection according to NEBS, the
Level 1 ESD test consists of 5 positive and 5
negative 2000 Volt hits to the board at 1-second
intervals. Level 2 is similar to Level 1 except
that it is at a higher voltage of 4000 Volts.
The same goes for Level 3 and Level 4 in which the
voltage is raised to 6000 Volts and 8000 Volts,
respectively. No scope photos were taken because of
the potential damage it may cause the scope and the
scope probes if the protection circuit were to
fail.
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Figure
11: Results of the 1000V Surge Test
Waveform after the Protection Circuitry of
the DUT (see text)
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SUMMIT
Microelectronics, Inc. reserves the right
to make changes to the products contained
in this publication in order to improve
design, performance or reliability. SUMMIT
Microelectronics, Inc. assumes no
responsibility for the use of any circuits
described herein, conveys no license under
any patent or other right, and makes no
representation that the circuits are free
of patent infringement. Charts and
schedules contained herein reflect
representative operating parameters, and
may vary depending upon a user's specific
application. While the information in this
publication has been carefully checked,
SUMMIT Microelectronics, Inc. shall not be
liable for any damages arising as a result
of any error or omission.
SUMMIT Microelectronics, Inc. does not
recommend the use of any of its products
in life support or aviation applications
where the failure or malfunction of the
product can reasonably be expected to
cause any failure of either system or to
significantly affect their safety or
effectiveness. Products are not authorized
for use in such applications unless SUMMIT
Microelectronics, Inc. receives written
assurances, to its satisfaction, that: (a)
the risk of injury or damage has been
minimized; (b) the user assumes all such
risks; and (c) potential liability of
SUMMIT Microelectronics, Inc. is
adequately protected under the
circumstances.
Revision 1.1 - This document supersedes
all previous versions and covers Status
Tracking Codes up to 10 and Windows GUI
revision 2.39.3 and later. Please check
the Summit Microelectronics, Inc. web site
at www.summitmicro.com
for data sheet updates.
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Copyright
© 2003 SUMMIT MICROELECTRONICS, Inc.
Power Management for Communications™
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