ROHM's PrestoMOS 600V Super Junction MOSFETs Empower Inverters

May 2, 2019 Alix Paultre

ROHM’s PrestoMOSTM series of 600V super junction MOSFETs is presented as having the industry’s fastest reverse recovery time (trr), optimized for EV charging stations and motor drive in-home appliances such as refrigerators and air conditioners (ACs). Reports show that close to 50 percent of the total power demand worldwide is used to drive motors. IGBTs are commonly used as switching elements in inverters that drive motors in home appliances such as refrigerators and ACs.

The PrestoMOSTM series ultra-fast trr enables a reduction in power loss of about 58 percent at light loads when compared with IGBT implementations. Additionally, raising the reference voltage needed to turn ON the MOSFET prevents self turn-ON, which is one of the main causes of loss. Optimizing the characteristics of the built-in diode improves the soft recovery index specific to super junction MOSFETs, which reduces noise that can lead to malfunctions.

ROHM’s R60xxJNx series takes measures against noise and self turn-ON, and optimizing the parasitic capacitance inherent within the MOSFET structure reduces unintended gate voltage during switching by 20 percent. In addition, the specialized design makes it difficult for self turn-ON to occur by increasing the threshold voltage (Vth) necessary for turning ON the MOSFET by 1.5x. Expanding the loss adjustment range due to gate resistance and other factors. By optimizing the internal structure, ROHM’s R60xxJNx series is also able to improve the soft recovery index by 30 percent over conventional products.

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