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24V input DC/DC module

The new 24V input PKM2810EPI from Ericsson Power Modules is a 3.3V/25A output module delivering up to 82.5W. The module is based on the same cost optimised platform used in the quarter-brick PKM-E series. The module’s high efficiency offers a good thermal derating performance, saving cost by simplifying thermal design. By optimising its circuitry and using special topology arrangements, the module’s building practice has been simplified, 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. Another benefit of the optimised PKM-E platform is the product’s 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. With its low height of 8.5mm, the PKM-E series is designed to ease board and mechanical designers’ jobs when integrating board-mounted modules into sub-systems. This feature also makes them suitable 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 module features a 1500V DC input to output isolation level. Because of its simplified design, low component count and high efficiency that reduces heat dissipated, according to Telecordia SR332 issue 1 Black Box technique, the module has an MTBF of 1.5million hours, providing improved 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.