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DRV8308: motor current not stable

Part Number: DRV8308
Other Parts Discussed in Thread: DRV832X

Hi, the customer is using DRV8308 to control a BLDC. VDC=28V, IDCmax=10A. The motor is powered by a battery.

In 120 commutation mode, the current is sometime high and sometime low, it will trigger the current protection in the system.

We've tried to tune the parameters but we can not make the current stable. I wonder how can I make the current stable?

180 commutation will result in startup failure sometime, so only 120 commutation is considered.