Hi,
I've designed a sensorless motor drive using DRV8301. I'm very satisfied by this IC, but I have a problem that I can't work out by myself.
During the first tests the gate drive section has broken down after a few hours of work. The buck section is still working but the gate drive is not. All the charge pump voltages are at 0V.
My supply voltage range is 35-60V and the damage has occured at about 45V, quite distant from the absolute maximum. The board was quite warm (40°C) but nothing dangerous.
My power section is quite similar to drv8301-hc-c2-kit. The only significant difference i see is that we are using two 1uF capacitors on GVDD instead of one 2.2uF. We should still be inside +/-20% raccomended range, but I don't know exactly what could happen with the DC bias applied.
Do you have any suggestion ?