Robust 600-V FRD MOSFETs deliver fast switching
Alpha and Omega Semiconductor Limited (AOS) has released two αMOS5™ 600-V FRD Super Junction MOSFETs, optimized to meet the high efficiency needs in LLC and PSFB converters as well as H-4 and cyclo-inverters in solar and energy storage system (ESS) applications
The design of today’s mid-high power switched-mode power supply (SMPS) and solar inverter systems boil down to four major challenges — higher efficiency, higher density, lower system costs, and uncompromised robustness. High Voltage Super Junction MOSFETs are the dominant choice for topologies such as single/interleaved/dual boost/CrCM TP PFCs, LLC, PSFB, multi-level NPC/ANPC and so forth.
αMOS5™ is AOS’s market and application-proven high voltage MOSFET platform, designed to meet the high efficiency and high-density needs of servers, workstations, telecom rectifiers, solar inverters, EV charging, motor drives and industrial power applications.
αMOS5™ has been the leading High Voltage Super Junction solution tailored for fast switching, ease-of-use and robustness in mission-critical applications. αMOS5™ FRD FETs are engineered with strong intrinsic body diode to handle hard commutation scenarios, when the freewheeling body diode is in reverse recovery due to abnormal operations, such as short-circuit or start-up transients. The two products released, the AOK095A60FD (TO-247) and AOTF125A60FDL (TO-220F), are 600-V FRD FETs with 95 mohm and 125 mohm maximum RDSon, respectively. In tests conducted by AOS engineers, the body diodes of these two FRD FETs have survived high di/dt, under abnormal system conditions, even at elevated junction temperatures of up to 150°C. Additionally, AOS tests have shown that these devices’ turn off energy (Eoff) are noticeably lower than the competition’s, which contributes to higher efficiency in light or mid-load conditions.
“We defined our products for traditional power supplies, as well as DC/DC and DC/AC converters of solar inverters and ESS systems, where bi-directional topologies are needed. As energy storage-ready inverters become the trend and high voltage batteries are utilized increasingly in AC-coupled systems, the AOK095A60FD and AOTF125A60FDL will become industry leading options for bi-directional DC/DC and inverter/PFC applications that serve a wide range of power supplies, solar PV inverters, and ESS hybrid converters,” said Richard Zhang, Senior Director of Product Line and Global Power Supply Business at AOS.
Technical highlights of the FRD MOSFETs include:
- Rugged, fast recovery diode (FRD) with reduced Qrr for demanding use cases.
- Engineered for both hard and soft switching topologies with ultra-low switching loss.
- Strong UIS and SOA capabilities.
- Engineered to prevent self turn-on.
- Suitable for LLC, PSFB, CrCM totem-pole, multi-level NPC and CrCM H-4/cyclo inverter applications.
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