Hi TI Team,
Recently I have found a problem with the custom boards based on the MCT chip.
Previously we had a motor running without any issues using the same layout and software. It was a max 3000 RPM motor, using 24V as a reference input voltage to the system. The issue we have found was that when we assembled two new boards and attached both Hall effects and the motor phases and successfully uploading code. When we powered the system, all outputs from the MCT chip were current, both the reference voltage and the buck regulator voltage were at 3.3V.
When a trigger input was applied the motor spun, seemed like it was working without any issue, spinning in the right direction and speeding up due to a PID controller. When it ran for about half a minute more the area near the VM pins (MCT input pins) burnt/got damaged. Rendering the MCT chip useless, but only that one component had damage on it, the rest of components onboard where fine. Although the pads where the VM input pins were had been permanently damaged.
Did this issue ever happen to anyone else you know off? What might the possible cause for this? Let me know if you need any more details from my side.
Regards,
Patryk Szczesny.
