Ericsson Power Modules' PKB4513PINBLC is a 50W eighth-brick DC/DC converter that powers 12V intermediate bus architectures.

Specifically, the module is designed for sealed enclosures where cooling is not based on conventional forced-air cooling and fans, but via passive cold-wall technology in applications such as power-amplifiers and transceivers.

This is largely facilitated by its wide input voltage range of 35 to 60V, 2250Vdc input to output isolation, and its application specific mechanical design where all the heat dissipating components are assembled on the top-side. 

The converter's low profile (8.73mm) makes it suitable for use in chassis with a 10mm inner height.  The specified MTBF is greater than 1.6 million hours.

The most important application areas for the PKB4153PINBLC are antennas and equipments such as power-amplifiers, combiners, monitoring, local repeaters and other applications embedded in sealed enclosures that are cooling plate (cold-wall) cooled.