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DRV8302: DRV8302 to be used with two phase motor

Part Number: DRV8302

Can I use DRV8302 with two phase motor - or there exists some other more appropriate part for usewith two phase brush motor?

I started drawing schematic - and then I wanted to make sure if there will be no problem if I do not use third half bridge.

In that case is it ok to leave lines hanging in air or should I tie them to GND?

Also if I use M_PWM to 3.3V (without need of INL lines), should I tie thouse to GND or is it ok to leave them float?

regards

5 Replies

  • Hi Zhivko,

    Yes, you can use the DRV8302 with a two phase motor. There could be a better choice depending on the motor specifications. What are the voltage and current requirements?

    If you are using M_PWM set high, it is recommended to connect the unused INL_x and INH_x to a logic zero. SL_x should be connected to GND. GL_x, GH_x. SH_x can be connected through a 1kOhm resistor to GND, which will indicate the low side of the unused phase is on. 

    Rick Duncan
    Motor Applications Team

  • In reply to Rick Duncan:

    Hi,

    I need to drive 2 brush motors each 5A-10A(start coditions), by 30V.

    I know drv8302 is not optimal since one phase will be left out, but I have reference design, already ytested and people use it:

    Another question I have is why there is only two shunts on drv8302, but there are three phases - so 3 shunts will be more logical is this compromise of a sort?

    If you think there is more suitable gate driver with current sense with amplifier please let me know.

  • In reply to Zhivko:

    Hi Zhivko,

    The DRV8302 would work.

    The number of shunts required depends on the BLDC algorithm.

    For trapezoidal, a single shunt is needed.
    For sinusoidal, two or three are required. Two can be used because the sum of the currents equals zero. Three are also used.

    Rick Duncan
    Motor Applications Team

  • In reply to Rick Duncan:

    On page 25 of datasheet, I see no vias on phase 3 "shunt" toward GND. Can you check if there should be no VIAS there as it is shown on page 25 datasheet? I marked them red on picture copied from datasheet.

  • In reply to Zhivko:

    Hi Zhivko,

    Yes, there should be vias at the location highlighted. Thank you for pointing this out.

    Rick Duncan
    Motor Applications Team

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