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DRV8432

Ron Kreymborg
Prodigy 10 points
Other Parts Discussed in Thread: DRV8432EVM, DRV8412

We are very interested in this chip as a bipolar stepper motor driver. Please advise when the DRV8432EVM board will be available.

Someone else has mentioned the drive waveforms and I am also interested in these as we propose driving the DRV8432 from out existing stepper motor drive hardware. We are currently assuming we can treat it as just two full bridges. There is no mention of dead times, so is it the driver's responsibility to insert dead times in the pulse train? Our existing hardware uses voltage feedback from small resistors in the GND lead of each bridge to control the current. Will this still be possible?

Regards
Ron Kreymborg
Kremford Pty Ltd

  • 0
    TI__Mastermind 18510 points

    Ron, we hope to release DRV8432 EVM by the end of this year, but by end of January at the latest.  You might ask your local TI sales office if they can get an EVM for you now.  In the meantime, DRV8412 EVM is available.  DRV8412 is similar to DRV8432, just lower current (2 x 3A continuous, 2 x 6A peak, but no heatsink is required).

    DRV8412/32 follow PWM inputs directly, so you will need to insert required dead time.

    DRV8412/32 half-bridge grounds are brought out independently and may be grounded through low-value (5 to 10 milliohm) resistors for current sensing.  Rev E and F EVMs, the current versions, include the resistors and current sense amplifiers following them.

    Regards,

    Steve.

     

  • 0 in reply to SteveCrump
    Prodigy 125 points

    To Mr Steve,

    About Dead Time:

    But , See if we give PWM_A then how we can control the dead time.Because this signal will be feed to  half bridge_A  it should be internally controlled.Because dead time is between high side gate driver to low side gate driver of the same half bridge.Suppose duty cycle is 50% then for 50% time high side gate driver should be on (and low side should be low)and for 50% low side gate driver should be on(and high side should be low)and dead time should be given in this time only,then how we can control it from outside.

    Please let me know where i am going wrong.

    Waiting very eagerly for your reply Mr Steve.

    With Regards,

    Vipin Patel

    CEDT,Bangalore

  • 0 in reply to SteveCrump
    Prodigy 145 points

    Steve,

    I am planning to use the DRV8432 in parallel mode to driver a single motor. Were can I find graphic examples of

    the PWM control waveforms needed - show if there is any special timing delay or phase relationships required. 

    I have not been able to find anything on the TI website or just googling.

    Thanks,

    Les Noel