ROHM Boosts Power Efficiency with New MOSFET Technologies

As power electronics systems face increasingly stringent efficiency standards and miniaturization challenges, the balance between switching speed and conduction losses has become the central design challenge for power devices. In the medium-to-high voltage power conversion range (190V to 800V), ROHM Semiconductor has developed advanced solutions through its Super Junction technology, delivering both high-frequency response and low-loss characteristics for modern power systems.

Super Junction Technology: Principles and Advantages

Traditional planar MOSFETs typically experience significant increases in on-resistance (RDS(on)) when improving voltage tolerance, resulting in substantial conduction losses. ROHM's Super Junction architecture addresses this by implementing multiple P-type pillar structures in the drift layer, enabling lateral charge compensation. This design maintains high breakdown voltage while dramatically reducing on-resistance per unit area, significantly improving current density.

The technology not only optimizes switching losses but also achieves a balance between low noise and high switching speed through precise process control, making it a critical component for improving power conversion efficiency.

Flagship Product Line: PrestoMOS™

For industrial and consumer electronics applications demanding maximum energy efficiency, ROHM's PrestoMOS™ series represents a technological breakthrough. The product line integrates industry-leading fast recovery diodes (FRD) and employs patented carrier lifetime optimization techniques to substantially reduce reverse recovery time (trr).

This innovation effectively addresses the thermal losses and electromagnetic interference (EMI) issues caused by excessive reverse recovery current in conventional MOSFETs during hard-switching circuits.

Application Scenarios and Selection Guidelines

ROHM's power MOSFETs demonstrate broad adaptability across various voltage levels and circuit topologies:

• Power Management and PFC Circuits: High-speed switching MOSFETs significantly improve conversion efficiency in power factor correction (PFC) circuits for PC power supplies, server power systems, chargers, and LED lighting, meeting rigorous standby power consumption standards.
• Variable Frequency Drives and Motor Control: The PrestoMOS™ series serves as an optimal solution for motor drives, inverters, and variable frequency appliances including air conditioners, washing machines, and refrigerators. Its superior switching characteristics reduce operational losses in variable frequency motors while extending equipment lifespan and improving acoustic performance.
• High-Efficiency Power Topologies: In Totem Pole PFC circuits and LLC resonant converters, PrestoMOS™'s fast recovery properties prevent failures caused by parasitic diode conduction, ensuring system stability across wide load ranges.
• Industrial Applications: The 800V series products are engineered for demanding industrial environments, suitable for industrial power supplies, solar inverters, and high-voltage LED drivers. Their robust design ensures reliable operation in complex grid conditions.

Through continuous technological innovation, ROHM continues to expand the performance boundaries of power semiconductors. Whether for compact power supplies requiring high-frequency operation or industrial motor drives prioritizing energy efficiency, these high-performance MOSFET products provide a solid hardware foundation for sustainable energy management solutions.