Switching a SiC MOSFET Power Module creates two significant problems that need to be addressed in order to optimize the performance of the device: turn-off voltage overshoot and ringing. These two parasitic problems need to be controlled while maintaining efficient switching.
Microchip’s AgileSwitch® line of patented Gate Drive products address these problems, controlling the turn-off di/dt by varying the gate voltage level and dwell time to one or more intermediate levels during turn-off. This process is typically referred to as Augmented Turn-Off™ or ATOff.
Designers are finally able to extract disruptive system-level benefits of SiC technology to shrink the size, noise, and field failures of auxiliary power units (APUs) in transportation vehicles.