DRV8838: The motor current is negative

Fabio Gou

Intellectual 2510 points

Part Number: DRV8838

The customer is using DRV8838 to drive a brushed motor.

But the motor current will decrease to negative value. And the speed of motor is very high.

Could you please why the current is negative?

over 1 year ago

0 Pablo Armet over 1 year ago

TI__Mastermind 37683 points

Hello Fabio,

Can you provide inductance and resistance of the motor? Can you provide the motor driver schematic you the customer?

What is the value of EN and PH? Are they PWM the signals and reversing direction?

Regards,

Pablo

0 Fabio Gou over 1 year ago in reply to Pablo Armet

TI__Intellectual 2510 points

Thanks for your help！I have emailed the schematic to you.

0 Pablo Armet over 1 year ago in reply to Fabio Gou

TI__Mastermind 37683 points

Fabio,

I will review schematic via email. I will close this thread for now and continue the discussion over email.

In the future, if you have any questions from your customer and you think you may have to share any confidential information, please post to the internal motor drives E2E forum.

Regards,

Pablo Armet

Motor drivers

Motor drivers forum

DRV8838: The motor current is negative