ROHM’s new 600V super junction MOSFETs

These devices are optimised for driving small motors in refrigerators, ventilation fans, and other applications where noise suppression is important.

Greater energy efficiency in equipment is required in recent years in response to the tightening of the global power supply, with motor drives accounting for up to 50% of the world’s total power demand. For this reason, 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 maintains 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% 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 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.

PrestoMOS

PrestoMOS is ROHM’s original power MOSFET that maintains the high withstand voltage and low ON resistance of Super Junction MOSFETs while speeding up the trr of the built-in diode. Reducing switching losses make it ideal for a wider range of applications with inverter circuits, such as air conditioners and refrigerators.