Part Number:DRV8302
Hi!
I'm working on a custom bldc drive using DRV8302 as it's Mosfet's gate driver. the problem is that in 6v<PVDD<8v nFAULT is toggling continuously. In 8v<PVDD nFAULT becomes zero with a few spikes and for PVDD greater than 15v it is completely zero. besides, GVDD for 15v<PVDD drops to zero. AVDD is a noisy signal about 6v and DVDD changes between 3v to 5v like a sawtooth waveform. I don't know what to do.
After a few days trying I replaced the drv but the problem exists. I'm sure the powertab is connected to ground and Drv doesn't get warm.
Buck is working correctly. nFAULT and PWRGD and nOCTW are pulled up to 3.3v.
thanks for your help.