DRV8876: DRV8876 driver design

Derek Zhong

Part Number: DRV8876
Other Parts Discussed in Thread: DRV8848

Dear TI,

I have a question to consult: about TI's DRV8876 driver design.

Application: To drive 12V cup-motor.Rated current: 315mA.

Expected results: PWM can be used to do speed regulation, when load changes, the impact on the speed of the motor need to be small. The motor need to achieve the maximum output.

Thanks for your check.

over 5 years ago

0 Wang5577 over 5 years ago

TI__Guru 56650 points

Derek,

Why do you attach DRV8848 schematic in your post? Do you want to use DRV8876 to replace the DRV8848?

For a brushed DC motor, the speed and load torque has a linear equation. The load increasing will cause the speed drop. If you want a constant speed with the load change, you may have to add additional circuit. Check this link:

https://e2e.ti.com/blogs_/b/industrial_strength/archive/2013/10/25/easy-cruise-control-for-brushed-motors-using-bemf

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DRV8876: DRV8876 driver design