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Rohm adds new 600V Super Junction MOSFETs


Low noise, super junction MOSFETS have fastest reverse recovery time

Rohm has added three new models, the R60xxRNx series, to its PrestoMOS lineup of 600V Super Junction MOSFETs. These devices are optimised for driving small motors in refrigerators, ventilation fans, and other applications where noise suppression is important.

High efficiency MOSFETs are increasingly being used in inverter circuits that convert power to drive motors. At the same time, however, countermeasures against noise generated from MOSFET operation typically involve adding components and/or changing circuit patterns, so there is a need to reduce both man-hours and costs. But reducing power loss and noise are generally in a trade-off relationship, making it difficult to achieve both.

To meet these needs, in 2012, Rohm began mass production of the PrestoMOS lineup of Super Junction MOSFETs featuring the industry's fastest reverse recovery time(trr) characteristics, which has received high marks for achieving lower power consumption. The lineup now includes three new models that provide best-in-class noise characteristics while maintaining the fast trr through an optimised structure.

The new R60xxRNx series is said to maintain the high-speed trr characteristics of PrestoMOS while minimising noise. An industry-best trr of 40ns is achieved by improving conventional lifetime control technology, reducing switching losses by approx. 30 percent over general products that translates to lower application power loss. At the same time, the newly developed Super Junction structure reduces noise characteristics (which are inversely related to faster trr) by about 15dB compared to standard products (under Rohm measurement conditions at 40MHz). Delivering industry-leading characteristics reduces the number of man-hours and parts required for noise countermeasures.

Going forward, Rohm says it will continue to expand its high voltage MOSFET lineup in different packages and even lower ON resistances that contribute to environmental protection by reducing power consumption in a variety of applications.

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