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DRV8886AT: How to reduce hold(stop) current of stepper motor

user5163865
Genius 3980 points
Part Number: DRV8886AT

Hi,

Does TI have a DRV with the function to reduce the hold current of a stepper motor?

Our customers use the ONSEMI : STK672-632A-E. This hybrid product has two excitation current modes, which can reduce the current while the motor is stopped.
According to the DRV8886AT data sheet, is the description in the section “7.3.5 Controlling RREF With an MCU DAC” a function that meets the customer's request?
Customers will use both bipolar and unipolar stepper motors.
Best regards,
Hiroshi
  • 0
    TI__Guru** 114905 points
    Hi Horishi-san,

    The TRQ pin can be used to change the hold current to 75% or 50% of the Ifs value. Please see Table 5 for details.

    If the hold current desired is different than 75% or 50%, the current flowing through the RREF pin can be adjusted as described in section 7.3.5.

    Another method is to use two resistors in parallel at RREF with a switch on one resistor.
    The hold current uses one RREF resistor, and operating current uses both RREF resistors in parallel.
  • 0 in reply to Rick Duncan
    Genius 3980 points

    Rick-san

    I'm sorry that I failed to make sure.

    Thank you for your advice.
    Best regards
    Hiroshi