AC/DC converter ICs are first with 1700V SiC MOSFET says Rohm

AC/DC converter ICs optimised for industrial applications focusing on auxiliary power supply for street lamps, commercial air-conditioning systems, general purpose inverters and for AC servo drives have been announced by Rohm Semiconductor.

The BM2SC12xFP2-LBZ series improves reliability and energy savings while reducing both mounting area and costs, says the company. The AC/DC converter ICs have a built-in 1,700V SiC MOSFET, packaged in a TO 263-7L package.

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 for auxillary power supplies, Rohm argues that a designer cannot achieve higher efficiency and increased out power to deliver different levels of DC voltages for gate drivers and control units. The reason for this is the higher losses of silicon (Si) devices. 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. They also increase the expense with a larger bill of materials (BoM).

The BM2SC12xFP2-LBZ power ICs are the quasi-resonant (QR) AC/DC converters with an integrated 1700V SiC MOSFET in a single surface mount TO263 package. Integrated into industrial auxiliary power supplies, they simplify circuit design, reduce the number of external components from 12 parts and a heatsink to just one. They also shorten design time, says Rohm.

In 400V AC 48W output auxiliary power supplies they enable automatic board mounting which was not previously possible. At the same time, adopting a SiC MOSFET improves power efficiency by up to five per cent and minimises the risk of component failure to increase reliability and energy savings in industrial equipment, reports Rohm.

There is also the BM2SC123FP2-EVK-001 evaluation board, using the AC/DC BM2SC123FP2-LBZ IC. The board delivers power up to 48W at 400V AC without a heatsink. The test result of the evaluation board shows the output voltage (24V) is constant and independent from input voltage.

Target applications are general purpose inverters, AC servos, programmable logic controllers (PLCs), manufacturing equipment, robotics, commercial air conditioners, industrial (i.e street) lighting as well as auxiliary power supply circuits handling indicators, fans, relays, and PLCs in 400V AC industrial equipment

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