Hi all,
I’m we are working on BLDC motor controller based on the DRV8301.
After switching on supply voltage BUCK converter works as expected - it provides stable voltage. After setting EN_GATE to high every driver gate works ok, but when I connect motor to the bridge FAULT signal goes low and on on every driver output I have high state. After disconnecting motor from bridge and power device again driver outputs remains in low state even outpus were enable by setting EN_GATE to high - signal FAULT is in low state.
Is this possible that driver was damaged due too high gate current? I'm using IRFS4410 transistor with Qg=120nC and Ciss = 5150pF Rg=10ohm and IRF540 Qg = 72nC, Ciss = 1960pF R=200ohm. I case of IRF540 FAULT appears within about 0.5 sec, while in case of IRFS4410 and Rg=10ohm it appears immediately after power on.
I attached schematics, it is based on reference desing. Any suggestions what can cause problem or how to debug this problem ?
Thanks!
