DRV8245-Q1: Transient current withstand capacity of DRV8244-Q1

Nanxiao Zhong

Part Number: DRV8245-Q1
Other Parts Discussed in Thread: DRV8244-Q1,

Hi Team

We know that DRV8244-Q1's maximum withstand continuous current is 20A. Is it have ability to withstand 25A peak current for 20ms when motor start working?

over 1 year ago

0 Ryan Kehr over 1 year ago

TI__Guru 54795 points

Hello!

The peak current capability is limited by the overcurrent protection threshold which is 21A.

If you need 25A peak currents, please consider the DRV8245-Q1.

Regards,

Ryan

0 Nanxiao Zhong over 1 year ago in reply to Ryan Kehr

TI__Intellectual 1200 points

Hi Ryan

Thanks a lot for your answer, so the current limit which you high light is varied from 21A to 40A. Is the range of change too wide？ Whether we need to design with the lowest protection current.

Another question is, take DRV8344 as an example, what is the recommended continuous current of this device, since I always think 21A is the maximum continuous current of the device

0 Ryan Kehr over 1 year ago in reply to Nanxiao Zhong

TI__Guru 54795 points

Hello,

There is a thermal calculator in the tool folder.

https://www.ti.com/product/DRV8243-Q1?keyMatch=DRV8243-Q1&tisearch=search-everything&usecase=GPN#design-development

Scroll down to "calculator" icon. This can be used to calculate continuous current as this a thermal limitation of the device and depends on many factors.

Yes, you should design to the lowest protection limit as is it possible this protection will trip there.

Regards,

Ryan

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DRV8245-Q1: Transient current withstand capacity of DRV8244-Q1