Ericsson’s ultra optimized DC/DC module provides more power and efficiency

Based on a cost optimized platform that has contributed to make
Ericsson Power Modules’ quarter-brick PKM-E series one of the most
successful throughout the world, and now using a combination of further
optimized topology and advanced components, the 24V input PKM2810EPI
delivers 65% more power that its predecessor, while improving
efficiency up to 92.5% at half-load and 89.5% at full-load.

PKM2810EPI is a 3.3V/25A output module delivering up to 82.5W. The
module is the first in the second generation of PKM2000EPI,
complementing Ericsson Power Modules’ portfolio to address the
mid-power 24V segment. The module’s high efficiency provides for a very
good thermal derating performance, saving cost by simplifying thermal

By optimizing its circuitry and using special topology arrangements,
the PKM2810EPI’s building practice has been simplified to an extreme
level, making it possible to mount all the components on one side of
the board, keeping the back side clean of components to simplify
baseplate attachment or connection to cold-wall cooling. A further
benefit of the optimized PKM-E platform is the product’s very light
weight – 25 grams – reducing energy during transportation and
board-stress when enclosed in sealed chassis.

The module is principally aimed at telecom systems powered by 24V
batteries and accepts input voltages from 18 to 36V. However, because
24V is a common voltage in industrial OEM applications such as process
control, automation, robotic, transportation and many others, the
product is actually perfectly suited to a very large range of
applications. This PKM2810EPI is also a very good product for when
customers are upgrading boards to replace older modules to achieve
higher-efficiency levels while reaping the cost benefit inherent to
PKM-E’s building practice.

As it has been in the ICT industry for several years, total cost of
ownership (TCO) is also becoming a very important criterion for
industrial applications. The inherent performance characteristics of
the PKM2810EPI are perfectly suited to such a requirement. Also, the
growing demand for cold-wall cooling systems require modules to fit
into an inner chassis that has an average component height of less than
10mm. With its low height of 8.5mm (0.33 in) the PKM-E series is very
well designed to ease board and mechanical designers’ jobs when
integrating board-mounted modules into sub-systems. This feature also
makes them perfectly suited for narrow board pitch applications with
board spacing down to 15mm.

Featuring versatile, useful controls, the module has an on/off control
that is referenced to the input side (positive and negative logic
options are available). A remote sense for the output voltage
compensates for output distribution drops, and an output voltage trim –
range from 2.97 to 3.63V – permits custom voltages and voltage
margining. Full protection facilities are included embracing output
over-voltage, input under-voltage, over temperature, monotonic
start-up, and output short circuit protection. For safety and
reliability, the PKM2810EPI features a 1500Vdc input to output
isolation level.

Because of it’s unique, simplified design, low component count and high
efficiency that reduces heat dissipated, according to Telecordia SR332
– issue 1 – Black Box Technique, the PKM2810EPI has an MTBF of 1.5
million hours, guaranteeing excellent system reliability over its
life-time. The product is compatible with the relevant clauses and
requirements of the RoHS directive 2002/95/EC, and fully meets
requirements in high-temperature lead-free soldering processes.

Introduced in February 2004, the Ericsson PKM-E ‘single side components
optimized platform’ has received very high levels of attention from a
broad range of industries, rewarding Ericsson’s innovation in seeking
to bring the most cost efficient solution to its customers, while
offering the highest performance levels. The addition of the further
optimized PKM2810EPI and other variants yet to come will offer more
options to its customers when considering cost reduction programs.


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