Hi,
I have been using the drv10983 chip to power a small 3 phase water pump. I have used both the EVM as well as a board I designed. I am finding that in either case, it is very common for the drv10983 chip to burn out and smoke when the DC power to the chip is briefly interrupted and then restored. It happens even if the motor is idle when the power disconnect happens.
The chip is being controlled under i2c from an attiny85 microcontroller that is being powered by the VREG (pin 6) output of the drv10983. The output is set to 5v, but the microcontroller runs at 3.3 v (It has it's own regulator). I have now seen this happen on 7 different chips, including on the EVM. It the case of the EVM there was no I2C control at all, the motor was connected but was not turning.
When the chip blows, it turns white hot in the area of pin 23.
What can I do to protect the chip from this failure. I can reproduce it within seconds on any chip.
The phase resistance of my motor is 2.78 ohms and the Phase to Phase Kt is 205 mV/Hz. It is a 24 pole motor.
The schematic is literally a copy of the EVM schematic, with the addition of the microcontroller.
Thanks,
Don