Compact surface mount AC/DC converter ICs with integrated high voltage SJ MOSFET

ROHM has developed AC/DC flyback converter ICs with an integrated 730V breakdown MOSFET: the BM2P06xMF-Z series (BM2P060MF-Z, BM2P061MF-Z, and BM2P063MF-Z). These devices are excellent for auxiliary power supply and SMPS solutions for industrial drives and home appliances – including air conditioners, white goods, and factory automation equipment. These flyback ICs require no additional heatsinks and no discharge resistors and capacitors. They help designers shorten design time, simplify the circuitry, reduce costs and increase reliability by providing integrated solutions.

In recent years, AC/DC converters for home and industrial use must support 85V-264V AC to accommodate different AC voltages around the world and comply with international standards such as Energy Star for energy savings IEC 62368 safety standard. It is also vital for AC/DC converter ICs to be surface mount to decrease factory mounting costs. However, as high heat/high loss DMOSFETs and planar MOSFETs are still broadly employed in AC/DC converter ICs, until now, it has been challenging to deliver tens of watts of output power in a surface mount package.

To solve these issues, the company created new compact surface mount high power 45W models BM2P06xMF-Z. They are supplied with an original low-loss SJ MOSFET jointly with optimised PWM control circuitry – enabling the development of 85V to 264V AC/DC converters. Acquiring a surface mount package supports automatic board mounting (which was previously challenging to achieve in the past). Meantime, the implemented functions assure compliance with the IEC62368 safety standard, even when the discharge resistor is removed. Furthermore, original low standby power control technology is applied – providing extremely low standby power consumption. Supply voltages up to 60V (VCC) are also supported – removing the requirement for an external step-down power supply circuit.

Compared to general products with equivalent performance, automatic mounting lowers factory mounting costs. Moreover, ROHM can reduce standby power by over 90% and the number of power supply circuit components by four, contributing to more significant power savings and higher application reliability.

Application Examples include consumer electronics such as air conditioners, appliances, monitors, and hair dryers; industrial equipment including inverters, AC servos, routers, and office automation devices; and is ideal for AC/DC converters up to 45W output in consumer and industrial applications.