Ericsson has announced a second new product in its high-power PKM-NH platform, the PKM4817 NH-PIHS, which employs the company’s innovative hybrid regulated topology. The platform is optimised for datacom board applications that have a 52–58V system bus distribution and require high-power regulated quarter-brick-format intermediate bus converters. The new PKM-NH delivers up to 864W with a power density of 35.6W/cm3 (581W per cubic inch) and follows the PKM4717NH, which was announced earlier this year and offered a high-power handling capability of 750W. To meet the challenge of packing this level of power into a fully regulated quarter-brick format DC/DC converter, Ericsson has deployed its highly innovative proprietary topology known as Hybrid Regulated Ratio (HRR). The topology combines two power-control methods – voltage-regulation and ratio-regulation – resulting in high performance across the input voltage ranges between 40V to 60V, which are commonly used in datacom systems. The HRR topology implemented in the Ericsson PKM-NH platform delivers an excellent response to line or load transients and guarantees the output voltage will remain stable and immune from voltage deviation due to power disturbances on the system bus voltage. This means it retains intermediate bus voltage integrity within the tolerance band required by power system architects. The new PKM4817NH-PIHS module delivers an output voltage from 8.6V to 10.8V at a maximum output current of 80A across an input voltage range of 40V to 60V, within the operational system voltage between 36V and 60V. A product of Ericsson’s ‘design-for-efficiency’ principle, the PKM4817NH has a typical efficiency of 97% at 50% load and offers flat-curve characteristics from 20A to 60A, reducing power losses to the lowest possible level and making a significant contribution to the reduction of energy consumption.
Ericsson Power Modules
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