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DRV8872-Q1: available for BLDC motor with built-in speed controller

Part Number: DRV8872-Q1
Other Parts Discussed in Thread: DRV8872, DRV8412

I have some questions. 

1. As shown below, using DRV8872-Q1 to connect BLDC with built-in speed controller. Is it right? 

2. If it is not available, do you recommend the DC motor driver for BLDC built-in controller?

3. What's the difference between DRV8872-Q1 and DRV8872? 

Thanks in advance. 

  • Jaeseung,

    1. You can disable the current regulation function and use DRV8872-Q1 as a power switch for this application.

    2. Do you want to use DRV8872 as a power switch and over current protection? If yes, you can put DRV8872 there as a power switch.

    3. DRV8872-Q1 is AEC-Q100 Qualified device for Automotive Applications:

    – Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature Range

    – Device HBM ESD Classification Level 2

    – Device CDM ESD Classification Level C4B

    DRV8872 is good for industrial applications.

    Both devices functions are same.

  • Thanks for your kind reply. 

    You mentioned the DRV8702 instead of DRV8872. (I think DRV8872 is available for motor has 3V PWM input pin, 12V power)

    1. Can I understand it is in the same context?

    2. Can I remove the sense resistor to use DRV8872 as a power switch? 

    3. Can I use the over current protection without the sense resistor?   

    Best regards, 

    Jaeseung

  • Jaeseung,

    Yes. DRV8872 is correct. I just updated my previous post.

    1. The context is the same.

    2.  If not using current regulation, connect ISEN directly to ground.

    3.  Yes. DRV8872-Q1 can have the over current protection without the sense resistor.

  • Wang5577, 

    Thanks for your kind reply. 

    I have an additional question. 

    If the motor current exceeds a certain value, I want to brake the motor using received fault signal. 

    I think overcurrent protection is what makes this possible, but the data sheet shows that the value of Iocp is fixed at 4.5A.

    Is there any way to lower this value? Or is there any adjustable product?

    Best Regards, 

    Jaeseung

  • Jaeseung,

    DRV8872 OCP threshold is fixed and cannot be changed. If you would like to select different OCP threshold, you may want to check DRV8412: the cycle-by-cycle overcurrent protection threshold can be set by the OC_ADJ pin.

    Or you can selection other low current motor drivers which can have a lower OCP threshold. http://www.ti.com/motor-drivers/brushed-dc-bdc-drivers/overview.html