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DRV11873: DRV11873 sometimes cannot start brushless motor

Eason Yuan
Intellectual 840 points
Part Number: DRV11873

Dear all,

Our customer met a question as following:

The DRV11873 has a small probability of not starting the brushless motor. If it is not re-powered, the motor will not start. At this time, the RD pin is pulled high, the FG pin is pulled high, the CPN pin is pulled low, and U, V, W, and COM are DC levels. What is the reason for this situation? RD pull-up should be lock protection, but what causes lock protection? In addition, the FG pin outputs a pulse frequency of 150 Hz under normal motor operation.

Thanks!