| SiC MOSFET Integrated AC/DC Converter IC
Increased reliability with various protection features such as FB OLP
Adopting a pseudo-resonant method instead of PWM in the control circuit

ROHM announced on the 12th that it has released the 'BM2SCQ12xT-LBZ', an AC/DC converter IC with a built-in 1700V withstand voltage SiC MOSFET for general-purpose inverters and AC servos handling high power, industrial air conditioners, streetlights, and other industrial equipment.
Recently, there has been an increasing adoption of SiC power semiconductors, which are capable of high voltage response, low power consumption, and miniaturization, instead of conventional Si power semiconductors in industrial equipment handling 400V AC.

However, many industrial devices incorporate auxiliary power supplies that provide voltage to various control systems, in addition to the main power circuit. These auxiliary power supplies widely utilize low-voltage Si-MOSFETs and high-loss IGBTs, which have become a major obstacle to achieving low power consumption.

In order to solve these problems, ROHM developed the world's first AC/DC converter control IC that drives high-voltage, low-loss SiC MOSFETs in 2015. The newly developed BM2SCQ12xT-LBZ is the world's first AC/DC converter IC with an integrated SiC MOSFET.

The BM2SCQ12xT-LBZ features a dedicated package developed for the integration of SiC MOSFETs. It incorporates a control circuit optimized for auxiliary power supplies in industrial equipment, such as a gate drive circuit for driving SiC MOSFETs, and a 1700V withstand voltage SiC MOSFET.
The new AC/DC converter IC achieved a significant reduction in the number of components by packaging up to 12 components (AC/DC converter control IC, 2 800V withstand voltage Si-MOSFETs, 3 Zener diodes, and 6 resistors) and a heat sink into a single package, compared to a discrete component configuration using conventional Si MOSFETs. In addition, SiC MOSFETs are resistant to high-power noise due to their high voltage resistance, allowing noise countermeasure components to be miniaturized.
In addition, by consolidating them into a single package, it has become possible to simultaneously achieve a reduction in the effort required for component selection and reliability evaluation of clamp and drive circuits, a reduction in component failure risk, and a reduction in development effort for the adoption of SiC MOSFETs.

In addition to high-precision thermal shutdown protection realized by incorporating SiC MOSFETs, it is also equipped with overload protection (FB OLP), overvoltage protection of the power supply voltage terminal (VCC OVP), overcurrent protection, and overvoltage protection of the secondary side voltage. By incorporating a variety of protection functions required for the power supply of continuously operating industrial equipment, it contributes to improving reliability.

The gate drive circuit optimized for driving SiC MOSFETs incorporated in this product enables the SiC MOSFET to perform to its full potential, thereby achieving up to 5% higher efficiency compared to products using conventional Si-MOSFETs. In addition, the control circuit of this product employs a pseudo-resonance method that enables high-efficiency operation with low noise compared to the general PWM method, thereby minimizing the impact of noise on industrial equipment.
In the high-voltage range, SiC MOSFETs have advantages over Si MOSFETs, including lower switching and conduction losses, the ability to handle high power, and resistance to temperature changes. Therefore, when employed in AC/DC converters and DC/DC converters, they enable lower power consumption and reductions in the number of components and mounting area through high power conversion efficiency, miniaturization of heat dissipation components, and miniaturization of coils due to high-frequency operation.

The BM2SCQ121T-LBZ, BM2SCQ122T-LBZ, BM2SCQ123T-LBZ, and BM2SCQ124T-LBZ, suitable for auxiliary power circuits of all industrial equipment with AC 400V specifications such as general-purpose inverters, AC servos, PLCs (Programmable Logic Controllers), manufacturing equipment, robots, industrial air conditioners, and industrial lighting, were released on the 12th and are scheduled to be released sequentially at other parts distribution sites in the future.