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200v
One of the greatest advantages of using the Wolfspeed SiC diode is thermal performance. These images shown here are thermal maps of the backside of the board in the flyback reference design. Note that at 200 VDC, 75 kHz and equivalent operating conditions, the silicon MOSFET with heatsink is running at 73˚C, but the Wolfspeed SiC device with heatsink is running at only 36˚C, a 50% decrease in temperature. This translates directly to thermal advantage in design and system reliability. In addition, the bottom image shows the Wolfspeed SiC MOSFET running without heatsink. Under these conditions, the silicon MOSFET would be driven to the thermal limit, but the Wolfspeed SiC MOSFET is running at only 48˚C (1/3 of the maximum junction temperature). Under these operating conditions, the heatsink is totally unnecessary for the 1700 V 1-Ohm SiC MOSFET. Switching losses are the source of heating at these conditions.
PTM Published on: 2013-10-30