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NAVSO
P-3641: Navy Power Supply Reliability Design & Mfg
Guidelines

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3.3 Output Power Density - Low Voltage

Output power density and reliability are
closely linked, since, with the same
techniques and components, an increase in output
power density is often accompanied by a
decrease in reliability due to increased
temperature and decreased component derating.
However, a new design to the same requirements
using a newer topology, fewer components and new
packaging techniques can result in improved
reliability. This section discusses the levels
of output power density of reliable
low-voltage power supply designs which are
generally achievable using standard
switching-mode power supply components and
topologies widely available in industry today.
These levels are inadequate for many new
applications. Future output power density
requirements imposed by military electronics
have been examined and the reliability values
which may be considered realistic for such
power supplies are estimated. Advanced design
techniques and nonstandard components which must
be utilized to achieve the joint objectives of
higher output power density and high reliability
are summarized.

Program management should be aware of the
complex interrelationships between output
power density and reliability to ensure that a
proper design approach has been
implemented.

Determining
Factors - Low Voltage

Typical
Levels Today

Future
Requirements

Techniques
for Higher Output Power Density

Nonstandard
Components for Higher Output Power
Density