Hello,
All indication is that the gate driver is not turning off when commanded if a desat condition is detected. When I simulate the same condition with TI's SPICE model of the device, the gate turns off, as commanded. Scope shot below shows the main question: why is the upper gate drive not turning off? Is it caused by desat? What other condition could cause it? --- scroll down to see the circuit...
here is the schematic which produced the trace above...