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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
Future
Requirements

Rapid technological advances in
computer and signal processing electronics
packaging, utilizing large-scale integrated
(LSI) circuits, very-large-scale integrated
(VLSI) circuits and very-high-speed integrated
circuits (VHSIC) have resulted in significant
reductions in the volume required to implement
complex electronic functions. The technological
advances have not been as great in power supply
electronics. Reliable power supplies with power
densities of 1 to 6 watts per cubic inch will
not satisfy the need of sophisticated systems
now being designed, much less those in the near
future.

System volume required for the power supply
is a function of both the system thermal
density and the output power density of the
power supply. Figure 3-4 presents a graphic
illustration of the percentage of system
volume required by the power supply for various
system load densities. As the system thermal
density increases, it is obvious that the
power supply density must also increase to avoid
a condition where the majority of the system
volume is occupied by the power supply. The
following is the methodology for using Figure
3-4 in conjunction with the worksheet in Appendix
D

when system volume and
power are known.

Step 1: Select System Load Density
Curve.

Step 2: Determine Power Supply Volume as a
percentage of System Volume from:

System Volume - Load Volume

------------------------------------------ X 100

Total System Volume

Step 3: Locate Power Supply Output Density
from the intersection of the "Supply % of
System Volume" with the selected System Load
Density Curve.

Step 4: Compare the determined Power Supply
Density with Calculation from Appendix
D to assess
effort/risk.

If the results are unacceptable, perform
tradeoffs and repeat.