Isolated eighth-brick dc/dc converters deliver 95% efficiency

Two dc/dc converter modules in eighth-brick formats handle up to 40-A and deliver up to 95% efficiency. The PKB4211D offers 95.3% and PKB4110D deliver 94.7% efficiency with regulated 5 and 3.3 V outputs at 50% load. Competitive products will typically dissipate approximately 8% more power at a full load of 40 A.


The two new modules target high-end and high-power applications that are powered by multi-cell batteries or rectifiers, commonly used in the Information and Communication Technologies (ICT) industry. Designed for distributed power architecture systems, they meet the needs of a wide range of ICT applications including telecommunications and networking, servers and storage systems, and industrial equipment.


Offering a wide voltage input range from 36 to 75 V, the PKB4211D delivers up to 200-W output power with a 5-V, 40-A output, and the PKB4110D provides up to 132 W with a 3.3-V, 40-A output. Both are available in an industry-standard DOSA-compatible five-pin eighth-brick footprint with dimensions of 58.4 x 22.7mm and low-profile height of 9.6mm.


The PKB4211D delivers full power of 5 V at 40 A in an ambient temperature of 70°C with 200-lfm airflow in an open-frame unit with no baseplate. The module can also deliver the same load in an ambient temperature of 80°C, with 200-lfm airflow with an optional heatsink.


The open-frame version of the PKB4110D provides full power, delivering a 3.3 V 40 A output at 80°C with 200-lfm airflow and at 85°C with 200-lfm airflow with a baseplate. While use of the modules’ optional baseplate offers improved thermal performance, the units can also be connected to a heatsink or cold plate.


Offering an MTBF of 9.33 million hours, the modules meet safety requirements according to IEC/EN/UL 60950-1 and offer input/output isolation of 2,250 Vdc. The series also includes many protection features including output-over-voltage protection, input-under-voltage shutdown, over-temperature protection, output short-circuit protection, and monotonic start-up and remote control capability.


Both units are available in through-hole and surface-mount versions, thereby providing flexibility for board assembly. Both devices are available now in production volumes, with OEM pricing at $27.25 for the PKB4211D and $25.70 for the PKB4110D. Ericsson Power Modules: www.ericsson.com/powermodules

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