• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 3 answers
  • Subscribers 29 subscribers
  • Views 351 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8870: How to use DRV8870 to drive a single-phase BLDC

Bella (GZ) Li
Intellectual 915 points
Part Number: DRV8870
Other Parts Discussed in Thread: DRV8801A-Q1, DRV8231A, DRV8251A

hi,

Thank you for your support.

As we known, there are no products in our company to drive single-phase BLDC directly.

So I want to design the single-phase BLDC by DRV8870 ,diagram is shown below:

I have the following questions:

1.How is the current direction of BLDC controlled? 

2.How is the speed of BLDC controlled?

3.Does the DRC8870 output require a filter?

4.How the output logic is different for BDC and single-phase BLDC?

Looking forward to hear from you.

  • 0
    TI__Mastermind 37683 points

    Hi Bella,

    I am from the brushed and steppers PL so I am not too familiar with BLDC motors. However, I found this app-note with useful information on BLDC motors. 

    This reference design shows how a brushed DC motor driver can be configured to drive a single phase BLDC with additional circuitry. In this example, the DRV8801A-Q1 is used but a similar procedure can be used for the DRV8870. 

    I hope all of the questions are answered in the reference design. Please let me know if there are any more questions.

    Regards,

    Pablo Armet

  • 0 in reply to Pablo Armet
    TI__Intellectual 915 points

    hi Pablo

    Thank you for your support and share.

    I have almost read the reference design.

    But I didn't find a way to control BLDC steering. In which case the rotation will be clockwise and in which case it will be counter-clockwise.
    Can you give me the answer?

  • 0 in reply to Bella (GZ) Li
    TI__Mastermind 37683 points

    Hi Bella,

    The direction of rotation will depend on the control input and the control truth table (see datasheet). 

    By the way, I talked with out BLDC team for support. They mentioned the DRV8251A or DRV8231A will be better drivers for this application. These two devices are similar to the DRV8870. 

    Regards,

    Pablo

  • 0 in reply to Pablo Armet
    TI__Intellectual 915 points

    hi Pablo,

    I have received,

    Thank you Pablo