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DRV8307EVM

WL66
Prodigy 20 points
Other Parts Discussed in Thread: DRV8307EVM, DRV8307, DRV10983, DRV10975, DRV8312, DRV8301, DRV8313

I just received the DRV8307EVM board and connected it to the power supply. The D3 LED flashes every 2~3 seconds. Connected U V W to a BLDC motor, D3 still flashes and the motor does not turn. U V W output about 600 mV DC. No PWM signal. I am wondering whether I have received a defective board, or if the board does not work with the motor I am using?

 

  • 0
    TI__Mastermind 20985 points

    Wei, first check the jumpers.  BRAKE should be installed so that it's Low and not braking.  SPEED should be installed to connect the on-board 555 timer to the PWM pin.  You can measure that clock with a scope if you're wondering about a board problem.

    And of course, there's always a chance that the phase wiring isn't right for your motor, so you can try all the combinations.  The Hall inputs might also need to be switched to get the proper mapping for your motor.

    If D3 periodically flashes, that is typically due to "RLOCK", where the DRV8307 is trying to drive, but there's no toggling on the Hall signals.

    Best regards,
    RE

  • 0 in reply to RE
    Prodigy 20 points
    Thanks. The motor I have do not have Hall sensors. Does the DRV8037EVM board need Hall signals to work? If yes, can I somehow bypass the Hall input? All I need is to drive the motor and change the speed.
  • 0 in reply to WL66
    TI__Mastermind 20985 points
    The DRV8307 is for sensored-BLDC and requires Hall sensors.

    How much current do you need to drive? Check out the DRV10975 or DRV10983, or for high current external control, the DRV8301, DRV8312, or DRV8313.

    Best regards,
    RE