DC/DC converter delivers high power capability to data networks
The latest member of the PKM-NH series, the PKM4817LNH has been optimized for parallel operation to power 2200 W boards in extreme-data-demand applications in the datacom industry.
Offering 800 W of power per unit, up to three PKM4817LNH modules can be connected in parallel to achieve a total deliverable power of 2200 W. 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 V to 60 V input voltage ranges commonly used in datacom 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 57.9 x 36.8 x 11.4 mm, the PKM4817LNH operates with an input voltage range of 45 V to 60 V and delivers an output voltage of 10 V-11 V at 80 A within the operational system voltage between 51 V and 60 V. Below 50 V, in regulated-ratio mode, the output voltage self-adjusts for optimal operation and secures a stable voltage of 9.0 V to 11 V, 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 an 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.
The PKM4817LNH also has a typical efficiency of 97.1 percent at 60 percent load and offers flat-curve characteristics from 20 A to 70 A, reducing power losses to a low level and making a contribution to the reduction of energy consumption.
The PKM4817LNH meets 2250 V 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.