DRV8835: DRV8835 reverse voltage protect solution

Shuang Feng76

Expert 3020 points

Part Number: DRV8835

Hi，

When motor brake suddenly and have a big reverse voltage. will this damage our DRV8835?

about this kind of situation, do we have any solution to fix it?

thanks in advanced for your help.

over 2 years ago

0 Grzegorz Pelikan over 2 years ago

Genius 3580 points

Hi Shuang,

Do you mean reverse voltage or current? Can you measure VM and motor current during braking? If you meant reverse current that is causing VM overvoltage you can use larger VM cap to store small braking energy (low speed or inertia), for higher energies you would probably need TVS or Zener diode or braking chopper.

Regards,

Grzegorz

0 Ryan Kehr over 2 years ago in reply to Grzegorz Pelikan

TI__Guru 54675 points

Shuang,

You might find this blog article interesting that discusses the reverse current that "pumps" up the supply. The ways to address this are exactly what Grzegorz is referring to.

https://e2e.ti.com/blogs_/b/industrial_strength/posts/art-of-stopping-the-motor-vm-pumping

The DRV8835 will be damaged by a voltage at VM that exceeds the abs. max voltage as specified in the datasheet.

Regards,

Ryan

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DRV8835: DRV8835 reverse voltage protect solution