Dear all,
I have designed a SiC-based three-phase 3-Level T-type NPC voltage source inverter for a motor drive application.
I am using the UCC5390 gate driver by TI to drive the MOSFETs.
The converter switches normaly at a switching frequency of 500Hz.
In frequencies higher than 25kHz the gate drivers' output voltage gets clamped on +VCC2 while the input is a pwm signal.
The result is shorting the phase.
I attach the figure.
Is it a known issue? Is the gate driver not rated for high frequency operation?
Thanks in advance. I am looking forward to hearing from you.
Best regards,
Giorgo