Power Novel voltage profile for 750W datacoms quarter brick
Called PKM4717NH, from 50-60V, the output is voltage regulated at 10.8V, delivering up to 70A.
From 40-50V, the output voltage if a fixed fraction of the input voltage – varying from 8.7 to 10.8V.
In fixed ratio mode, suppression techniques prevent input transients being passed to the output un-attenuated.
The firm is calling this mixed regulation ‘hybrid regulated ratio’ (HRR).
The power supply will also deliver 10.8V with inputs up to 72V with reduced performance.
10.8V is chosen during voltage regulation because: “Based on a bus-voltage optimisation study carried out by Ericsson, the optimal fixed voltage to limit board conduction losses during step-down conversion at the point-of-load is believed to be 10.8V in non-‘dynamic-bus-voltage’ applications,” said the firm. “This bus voltage is very common in datacom applications that no longer require the standard 12V supply to power disk drives. However, if this level is required for local sub-functions, then step-up POL converters can easily generate a 12V supply.”
Claimed power density is 31.12W/cm3 (508W/in3) and typical efficiency is 97.1% at 60% load.
The PKM-NH series uses the ‘two extra power pins’ footprint, although there is a version compatible with traditional five-pin intermediate bus converters. The quarter-brick format is 59.9×36.8×11.4mm.
A baseplate version is available for applications requiring additional cooling or a cold-wall attachment.
Input/output isolation is 2.25kV and protection includes: input overvoltage suppression, soft-start for high capacitance loads, delayed hiccup over-current protection, over-temperature protection, over-voltage and under-voltage lockout, and pre-bias start-up functionality.
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