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DRV8801-Q1: about PHASE control

toshi-e2e
Genius 4830 points
Part Number: DRV8801-Q1

Hi all,
I have questions about the PHASE control of DV8801-Q1 as below;

(1) If CW / CCW switching is performed by PHASE signal while ENABLE = "H",  
     Is there a problem with the drive stage or IC?

(2) Is it necessary to change CW / CCW while ENABLE = "L"?
     If yes,
      Is it necessary to confirm the motor stop?
      Under what conditions can you change PHASE even if you keep ENABLE = "1"?

【Motor specification】: DC brush motor
· Rated voltage: 24 VDC
· Rated load: 9.8 mNm
· Rated power consumption: 1.4 W
* Actually, it is used at DC 20 V, and the steady current value is 250 ~ 350 mA.

Best regards,
Toshi

  • 0
    TI__Guru** 114905 points
    Hi Sagara-san,

    (1) If CW / CCW switching is performed by PHASE signal while ENABLE = "H",
    Is there a problem with the drive stage or IC?

    >> The answer depends on the operating conditions and system design. Assuming the absolute maximum ratings are not exceeded, there should be no problem doing this. Please see additional details below.

    (2) Is it necessary to change CW / CCW while ENABLE = "L"?
    If yes,
    Is it necessary to confirm the motor stop?
    Under what conditions can you change PHASE even if you keep ENABLE = "1"?

    >> Assuming the absolute maximum ratings are not exceeded, there should be no problem doing this. Please see additional details below.

    Additional details. Switching the direction of the motor instantly can result in an overcurrent condition. The overcurrent circuitry will disable the outputs for 1.2ms resulting the current flowing back to VM. If VM is near the maximum recommended voltage and the bulk capacitors are too small, the device could be damaged.

    It is recommended to stop the motor prior to switching directions for this reason.