DRV8307: The drive waveform is abnormal

Annie Liu

Part Number: DRV8307

Hi Team,

UHS_GATE：/resized-image/__size/640x480/__key/communityserver-discussions-components-files/121/pastedimage1687850521078v3.png

ULS_GATE：

The motor cannot be started when the PWM duty ratio is lower than 20.

Attach the circuit diagram

Could you help to check it?

Best Regards,

Annie

over 2 years ago

0 Joshua Horlander Cruz over 2 years ago

TI__Mastermind 24740 points

Hi Annie,

I will need sometime to look into this issue. I will reach out to you by Friday at the latest.

Regards,

Joshua

0 Joshua Horlander Cruz over 2 years ago in reply to Joshua Horlander Cruz

TI__Mastermind 24740 points

Hi Annie,

The schematic image is a little burry, could you provide a clearer version of the image?

Annie Liu said:
ULS_GATE：

Was there meant to be a capture linked after this comment, like with the UHS-GATE: ?

Thank you,

Joshua

0 Annie Liu over 2 years ago in reply to Joshua Horlander Cruz

TI__Genius 10295 points

Hi Joshua,

ULS_GATE：/resized-image/__size/640x480/__key/communityserver-discussions-components-files/121/pastedimage1688001655605v3.png

Schematic ：/resized-image/__size/1920x1080/__key/communityserver-discussions-components-files/121/pastedimage1688002017544v5.png

Hall sensor input is normal. The DRV8307 chip has been replaced, and the waveform is consistent. The waveform is the same after the PCB has been changed several times.

Regards,

Annie

0 Joshua Horlander Cruz over 2 years ago in reply to Annie Liu

TI__Mastermind 24740 points

Hi Annie,

Thank you for the images, I will look them over and get you a response by next Thursday at the latest.

Regards,

Joshua

+1 Joshua Horlander Cruz over 2 years ago in reply to Joshua Horlander Cruz

TI__Mastermind 24740 points

Hi Annie,

Does the FAULTn pin go low when trying to drive the motor below 20% duty ratio?

There seems to be a spike on the high side gate signal before the gate is turned on. Could a capture containing xHSG, the phase voltage, and xLSG be provided?

In the schematic VM seems does not have a bulk capacitance of 47uF or larger as recommended in the datasheet, is the value for C7 greater than 47uF?

Regards,

Joshua

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

TI__Mastermind 18981 points

Hi Annie,

Do you still require further assistance on this?
Please help mark the thread as resolved if there are no further questions. Thanks.

Best Regards,
Andrew

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DRV8307: The drive waveform is abnormal