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DRV11873: Start up current limit

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Part Number:DRV11873

Hi

Now we are testing a motor operation with DRV11873EVM.

However, we are facing problem the motor fails to start to spin sometimes.

The jumper setting is default except for J2/FS is uninstalled. And 12VDC power supply is connected.

Motor terminals are connected to COM, MOTA, MOTB and MOTC on the EVM respectively.

We obtained following waveform at motor start up.  This capture indicates a waveform that motor can start to spin.

A phase current flows up to over 3A at motor start up but DRV11873 had been operational.

Is this current flow acceptable? 

Do you think the cause of motor failing to spin is that the motor start up current could not meet DRV11873's spec?

BestRegards


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