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Rohm has launched a surface mount AC-DC fly-back converter with an integrated 730V breakdown MOSFET

The BM2P06xMF-Z series (BM2P060MF-Z, BM2P061MF-Z, and BM2P063MF-Z) is aimed at auxiliary power supply and Switch Mode Power Supply (SMPS) designs for industrial drives as well as home appliances such as air conditioners, white goods, and factory automation equipment. The fly-back ICs require no additional heatsinks and no discharge resistors and capacitors and so help designers to shorten design time, simplify the circuitry, reduce costs and increase reliability.

In recent years, AC-DC converters for home and industrial use must not only support 85V-264V AC to accommodate different AC voltages around the world, but also comply with international standards such as Energy Star for energy savings and the IEC 62368 safety standard. It is also important for AC-DC converter ICs to be surface mount to reduce factory mounting costs. However, as high heat/high loss DMOSFETs and planar MOSFETs are still widely used in AC-DC converter ICs, until now it has been difficult to provide tens of watts of output power in a surface mount package.

To solve these issues, ROHM developed new compact surface mount high power 45W models BM2P06xMF-Z. They are equipped with an original low-loss SJ (Super Junction) MOSFET together with optimized PWM control circuitry – facilitating the development of 85V to 264V AC/DC converters. Adopting a surface mount package supports automatic board mounting (which was previously difficult to do in the past). Meanwhile, the implemented functions ensure compliance with the IEC62368 safety standard, even when the discharge resistor (a source of loss during standby) is removed. Additionally, original low standby power control technology is applied – resulting in extremely low standby power consumption. Supply voltages up to 60V (VCC) are also supported – eliminating the need for an external step-down power supply circuit.

Compared to general products with equivalent performance, automatic mounting contributes to lower factory mounting costs. The device also reduces standby power by over 90 percent along with the number of power supply circuit components by four, contributing to greater power savings and higher reliability in applications.

Samples are available now with mass production in January 2022, available with an evaluation board through Digi-Key, Mouser, and Farnell.

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