864W quarter-brick DC/DC module for datacom supplies

November 14, 2013 // By Graham Prophet
Ericsson has introduced a hybrid regulated ratio DC/DC converter that handles 864W: the PKM-NH platform quarter-brick module delivers high power density of 35.6W/cm3 (581W per cubic inch), with a flat-curve, high-efficiency of up to 97%

The second product in the high-power PKM-NH format, the PKM4817NH-PIHS 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 PKM-NH follows the PKM4717NH, which has 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 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. 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. It comes in the industry standard quarter-brick format measuring 57.9 x 36.8 x 14.3mm (2.28 x 1.45 x 0.56-in.). The module comes with two extra power pins to decrease power losses and guarantee optimal current distribution; these two extra power pins were introduced in 2004 and the package claims to be the most optimised footprint for high-power density DC/DC converters. In addition, the module also comes with a machine-tooled baseplate, guaranteeing excellent thermal conduction and cooling performance.

The PKM4817NH-PIHS provides 2250V input/output (I/O) isolation meeting