AC/DC converter ICs with built-in 1,700V SiC MOSFET

25th June 2021

Alex Lynn

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ROHM’s AC/DC converter ICs with a built-in 1,700V SiC MOSFET, BM2SC12xFP2-LBZ in the TO 263-7L package, are optimised for industrial applications focusing on auxiliary power supply for street lamps, commercial air-conditioning systems, general-purpose inverters and for AC servo drives.

An auxiliary power supply is an essential and vital part of industrial applications to deliver different levels of DC voltages for gate drivers and control units. By applying existing Si MOSFET devices, the designer cannot achieve higher efficiency and increased out power because of the higher losses of Si devices. The existing solutions require a heatsink and additional components which increase both the losses of the devices and the size of the system by additional space. To design an auxiliary power supply with existing Si devices will also be expensive because of a larger Bill of Material (BOM).

ROHM’s BM2SC12xFP2-LBZ power ICs are the Quasi-resonant (QR) AC/DC converters with an integrated 1,700V SiC MOSFET in a single compact surface mount package (TO263). These ICs are the right fit and best in class products for industrial auxiliary power supply solutions in terms of efficiency, shortening design time, simplifying the circuitry and reducing additional components by offering integrated solutions. These ICs also increase product reliability by minimising the risk of component failure.

When used in 400VAC 48W output auxiliary power supplies, besides enabling automatic board mounting that was not previously possible, the number of external parts can be significantly reduced compared with standard configurations – from 12 parts and heat sink to just one.

At the same time, adopting a SiC MOSFET improves power efficiency by up to 5% and minimises the risk of component failure. This makes it possible to dramatically increase reliability and energy savings in industrial equipment while significantly reducing mounting area and costs.

In addition, ROHM’s Evaluation board BM2SC123FP2-EVK-001 using our AC/DC BM2SC123FP2-LBZ IC is available to support designers. This board delivers power up to 48W at 400VAC without any heatsink. The test result of the evaluation board shows the output voltage (24V) is constant and independent from input voltage.

ROHM is committed to continuing to develop advanced analog control ICs and power semiconductors, such as SiC devices, while providing optimised solutions that contribute to greater energy savings and performance in industrial equipment