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DRV8434A: DRV8434APWPR can replace DRV8424PWPR ?

Annie Liu
Genius 10295 points
Part Number: DRV8434A
Other Parts Discussed in Thread: DRV8424EVM, , DRV8424,

Hi Team,

Customer would like to know is DRV8434APWPR able to replace DRV8424PWPR? Pins 19 to 21 of the chip are not used. 

8424: 19: TOFF, 20: DECAY1, 21: DECAY0, these three pins are for setting and controlling PWM

8434A: 19: STL_REP, 20: TRQ_CNT/STL_TH, 21: STL_MODE, these three feet are stall detection,

8434A does not have the 3 pins of 8424, how to set and control the PWM mode?

Thanks,

Annie

  • 0
    TI__Guru 56650 points

    Annie,

    DRV8434PWPR is pin to pin compatible with DRV8424PWPR. 

    DRV8434APWPR is different than DRV8434PWPR and SRV8424PWPR. DRV8434APWPR supports stall detection function with analog torque_count output pin. 

    Since DR8434A supports the stall detection function. The decay mode is the smart tune ripple control decay mode.  Don't need DECAY0/1 and TOFF to setup the decay mode.

    Regards,

    Wang Li

  • 0 in reply to Wang5577
    TI__Genius 10295 points

    Hi Li,

    Under the same parameter conditions, DRV8434APWPR is about 1/3 slower than DRV8424PWPR. Could you have any suggestion for this case?

    Thank,

    Annie

  • 0 in reply to Annie Liu
    TI__Guru 56650 points

    Annie,

    Do you mean the motor speed is slow with the same STEP frequency? 

    Regards,

    Wang Li

  • 0 in reply to Wang5577
    TI__Genius 10295 points

    Hi Wang Li,

    Yes, In the case of the same frequency, it is about 20% slower, and the acceleration and deceleration will not increase the speed.

    Thanks,

    Annie

  • 0 in reply to Annie Liu
    TI__Guru 56650 points

    Annie,

    Do they test the speed with DRV8424EVM and DRV8434AEVM?

    Can you share the STEP pin signal and OUTPUT current waveform here?

    Regards,

    Wang Li

  • 0 in reply to Wang5577
    TI__Genius 10295 points

    Hi Wang Li,

    Customer used his own boards. STL_MODE = 0. When the motor is moving or locked, TRQ_CNT/STL_TH is always 0 and there is no voltage change. TL_REP is always 0 when it is locked, it has not changed to high, and the pull has been added.

    Thanks,

    Annie

  • 0 in reply to Annie Liu
    TI__Guru 56650 points

    Annie,

    DRV8424 and DRV8434A are not pin to pin compatible device. Please make sure the device is DRV8434A, not DRV8424. BTW, DRV8424 doesn't support stall detection and doesn't have STL_MODE pin and TRQ_CNT pin.

    If they put DRV8434A on their board, what is the motor spinning speed? Does STEP pin signal have jittering?

     

    Regards,

    Wang

  • 0 in reply to Wang5577
    TI__Genius 10295 points

    Hi Wang,

    It is DRV8434A. Rotation speed is 100. STEP has no jitter. STL_REP is always low when the motor is blocked. TRQ_CNT/STL_TH voltage is almost 0. FAULT is high.

    Thanks,

    Annie

  • 0 in reply to Annie Liu
    TI__Guru 56650 points

    Annie,

    Let me clarify your statement:

    The driver is set to Torque Count mode (STL_MODE = 0), motor speed is 100 step/s with full step setting. TRQ_CNT/STL_TH voltage is zero. STL_REP is low.

    Please help me confirm the test condition detail: motor speed is 100 step/s with full step setting.

    After confirm the test condition: the only abnormal is the RQ_CNT/STL_TH voltage is zero. Please check and share the motor coil current with 100 full step/s.

    BTW, I attached the DRV8434A GUI user's guide here as reference for stall detection setting. Please check page 10 "3.3.2 Stall Detection" section.

    3731.DRV8434AEVM GUI user's guide SLOU547.pdf

    Regards,

    Wang Li