Motor drivers

Motor drivers forum

Overcurrent protection in DRV8837

norman werner

Prodigy 20 points

Other Parts Discussed in Thread: DRV8837

Hello,

i try to use the DRV8837 for a measurement system to revert the direction of current. However at times the overcurrent protection of the DRV8837 trips at current spikes.I think I understand the underlying problem - however for proper dimensioningI would need more information regarding the overcurrent protection like maximum tolerable overcurrent time. Are there any additional information/specs besides the datasheet available?

Best Regards

Norman Werner

over 13 years ago

Ryan Kehr over 13 years ago

TI__Guru 55565 points

Norman,

Give me a day as I searching for the answer.

Ryan Kehr over 13 years ago in reply to Ryan Kehr

TI__Guru 55565 points

Norman,

There are 2 pieces of information that would be helpful to you.

1) The deglitch time, or time before OCP is triggered after OCP level (in datasheet) is exceeded, is maximum of 1.25us. A small window.

2) The other key piece of information is the retry time between an OCP event and the time when the driver re-enables the outputs. This is ~1ms.

norman werner over 13 years ago in reply to Ryan Kehr

Prodigy 20 points

Thanks. The 1.25us number was just what i needed.

Norman Werner