DRV8307: DRV8307 FAULTn active analyze

Guangyan Liu

Intellectual 2130 points

Part Number: DRV8307

Dear Expert

Good day!

Our customer want to test the driver signal , so they set the test condition below:

1.Do not connect the Motor

2.Short the Rsense to GND.

3.Supply the Hall signal external ,

They found that , the faultn will active low immediately when PWM is supply , it will last 5ms low then recover 5us high ,move in circles. I had check the datasheet , only OC/OT /rotor stall will let the faultn pin active .

I had confirm with the customer .

1.it does not looks like rotor stall , if we do not supply the Hall signal , the Faultn will wait 3s , if we supply the hall signal ,it will become low immediately .

2.it does not looks like OT , because the device never active .

3.it does not looks like OC , because the Vsense pin is set to short to GND .

So could you help me to confirm , is there any other reasons could cause the Faultn pin active ?

Best regards

Leon.liu

over 2 years ago

0 Matt Hein over 2 years ago

TI__Mastermind 21805 points

Hi Leon,

The team is out today for the Independance Day holiday in the US. We will get back to you soon!

Thanks,

Matt

+1 Andrew Liu over 2 years ago

TI__Mastermind 18916 points

Hi Leon,

Thanks for your patience - we have looked into the info provided, and want to ask for some more information:

Would it be possible to provide the info below?

1) Scope capture (on the same window) of : U voltage, V voltage, W voltage, and VM voltage

2) Schematic of the device and board, so that we can investigate the other device inputs

3) Also, can you help check if the charge pump is working properly? (voltage between CP1 and CP2, or between VCP and GND)

Best Regards,

Andrew

0 Guangyan Liu over 2 years ago in reply to Andrew Liu

TI__Intellectual 2130 points

Hi Liu ,

Thank you for your reply .

The problem had been solved , it is welding problem.

BR,

Leon.liu

Motor drivers

Motor drivers forum

DRV8307: DRV8307 FAULTn active analyze