1700 V CoolSiC MOSFET Targeting Auxiliary Power Supplies

Infineon Technologies has added 1700 V to its CoolSiC MOSFET portfolio with its proprietary trench semiconductor technology. Maximizing the strong physical characteristics of silicon carbide (SiC), this ensures that the new 1700 V surface-mounted devices (SMD) offer superior reliability, as well as low switching and conduction losses.

The CoolSiC MOSFETs 1700 V are targeting auxiliary power supplies in three-phase conversion systems such as motor drives, renewables, charging infrastructure and HVDC systems.

With the new CoolSiC MOSFETs 1700 V in SMD package, this topology is now even enabled for DC-link connected auxiliary circuits up to 1000 VDC input voltage. High efficiency and high reliability auxiliary converters using a single-ended flyback converter can now be implemented in three-phase power conversion systems. This leads to smallest footprints and a reduced bill-of-materials.

The 1700 V blocking voltage eliminates design concerns regarding overvoltage margin and reliability of power supplies. CoolSiC trench technology features lowest device capacitances and gate charges for transistors of this voltage class. The result is a power loss reduction by more than 50 percent and 2.5 percent higher efficiency compared to state-of-the art 1500 V silicon MOSFETs. The efficiency is 0.6 percent higher, compared to other 1700 SiC MOSFETs. The low losses enable compact SMD assembly with natural convection cooling without the need for a heatsink.

The new 1700 V CoolSiC trench MOSFETs are optimized for flyback topologies with +12 V / 0 V gate-source voltage compatible with common PWM controllers. Thus, they do not need a gate driver IC and can be operated directly by the flyback controller. On-resistance ratings are 450 mΩ, 650 mΩ or 1000 mΩ. The new 7 lead D2PAK SMD package offers extended creepage and clearance distances over 7 mm. With that, it fulfills the usual 1700 V application requirements and PCB specifications, minimizing isolation efforts for the design.


CoolSiC MOSFETs 1700 V in D2PAK-7L package are available and in series production. More information is available at www.infineon.com/coolsic-mosfet.