DRV8312: driver output voltage is shorted with GND

Rehaman Tulugu

Part Number: DRV8312

Hello Support,

DRV8312 Driver IC used to derive 3-phase BLDC motor, When motor not connected to the driver we have observed 10V on each phase(A, B, C ) the After using few days one of the driver phase(B) gone bad. Now we have measured the voltage on each phase, on A and C phase voltage is 10V and on C Phase voltage is 2.5V.

We have seen this issue very frequently in our design, Can anyone explain what could be the reason for failure.

Driver operating voltages:

VDD1-12V

PVDD-24V.

Thank you,

Rehaman.

over 4 years ago

0 Adam Sidelsky over 4 years ago

TI__Guru 61200 points

Rehaman,

Thanks for posting on the Motor Drives Forum.

Have you checked the OUT_X pins with a scope near the DRV to see if the ABS MAX of the DRV is being violated? My estimation is that without the motor you have overshoot and undershoot on the Output lines which is killing the driver eventually.

Are you using your own board or an EVM?

Regards,

-Adam