DRV8873: The maximum transient current

Zoey Wu

Expert 5835 points

Part Number: DRV8873

Hi team，

my customer is using DRV8873 and they found that the output current will be up to 30A for about 24ms.

Will this damage the chip? And what is the maximum transient current that the chip can tolerant? Thanks!

over 2 years ago

0 Akshay Rajeev Menon over 2 years ago

TI__Mastermind 23426 points

Hey Zoey,

Thank you for your question.

This device is only rated for a max 10A peak output drive current. So operating at 30A for 24ms can lead to driver damage. The OCP will trip if the current exceeds 10A for longer than 3us. Otherwise you might also run into a thermal shutdown. We only have information on the maximum output current and not on the transient current.

Best,

Akshay

0 Zoey Wu over 2 years ago in reply to Akshay Rajeev Menon

TI__Expert 5835 points

Hi Akshay,

u can refer to below picture and the output current is shown as yellow.

After the braking, the current renewal time will be about 20ms. Do u have any advise on this case?

0 Akshay Rajeev Menon over 2 years ago in reply to Zoey Wu

TI__Mastermind 23426 points

Hey Zoey,

Could you explain the use scenario a little more? Is the customer spinning a motor and if so at what current and voltage? And then the brake is applied? Is the customer seeing any damage?

Also the image is very blurry, could you upload the image with higher resolution or put it in a PPT or zip?

Best,
Akshay

0 Zoey Wu over 2 years ago in reply to Akshay Rajeev Menon

TI__Expert 5835 points

Hi Akshay,

Thanks for your response.

The scenario is that the motor is short after the motor spins normally. They current is 2A and the voltage is 12V and then the brake is applied. They didn't see any damage.

0 Akshay Rajeev Menon over 2 years ago in reply to Zoey Wu

TI__Mastermind 23426 points

Hey Zoey,

Thanks for the additional information.

Why is the the driver output shorted if you are going to brake the motor? Also the chance for driver damage exists if current higher than the abs max is applied at the outputs.

Best,
Akshay

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DRV8873: The maximum transient current