Power

DC/DC converter suits data-intensive applications

30th April 2015
Barney Scott

Ericsson has introduced a DC/DC converter module based on the company’s innovative power topology known as Hybrid Regulated Ratio (HRR) technology. The latest member of the PKM-NH series, the PKM4817LNH has been optimised for parallel operation to power 2200W boards in extremely data-intensive applications in the datacomms industry.

Offering 800W of power per unit, up to three PKM4817LNH modules can be connected in parallel to achieve a total deliverable power of 2200W. Parallel mode uses Droop Load Sharing, which means the output voltage has a typical droop characteristic, whereby the output voltage slightly decreases when the load is increasing, while staying within system voltage limits.

Ericsson’s advanced HRR topology combines two power-control methods, voltage-regulation and ratio-regulation, and guarantees high performance across the 45 to 60V input voltage ranges commonly used in datacomms systems that are powered by front-end rectifiers. HRR offers excellent response to line and load transients and guarantees the output voltage will remain stable and immune from voltage deviations that are due to power disturbances on the system bus. This means it retains intermediate bus voltage integrity within the tolerance band required by power system architects.

Available in a quarter-brick format with a footprint of 57.9x36.8x11.4mm, the PKM4817LNH operates with an input voltage range of 45 to 60V and delivers an output voltage of 10-11V at 80A within the operational system voltage between 51 and 60V. Below 50V, in regulated-ratio mode, the output voltage self-adjusts for optimal operation and secures a stable voltage of 9.0 to 11V, even if the system bus voltage delivered via the front-end rectifier is operating abnormally. Obtaining a stable and regulated voltage while the system bus runs its normal operational voltage becomes a highly important capability to avoid traffic disruption, as well as providing enough time for system monitors to take required action and either turn on redundant power units or potentially shut down part of the system.

A product of Ericsson’s ‘design-for-efficiency’ principle, the PKM4817LNH also has a typical efficiency of 97.1% at 60% load and offers flat-curve characteristics from 20 to 70A, reducing power losses to a very low level and making a significant contribution to the reduction of energy consumption.

“The ability to operate these advanced high-power-density DC/DC converters in parallel meets the increasing need in the datacomms industry for ever higher power with boards now reaching 2kW,” Patrick Le Fèvre, Marketing and Communication Director, Ericsson Power Modules. “The combination of Ericsson’s HRR technology and the ability to easily parallel these modules makes it possible to deliver the necessary high-density power required in extreme data traffic applications.”

The PKM4817LNH meets 2250V I/O functional isolation requirements and includes a number of I/O protection and operational features including input overvoltage suppression, soft-start for handling of high capacitance loads, delayed hiccup over-current protection, over-temperature protection, over-voltage and under-voltage lockout.

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