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DRV8835: reduce motor starting current

cafain
Mastermind 6755 points
Part Number: DRV8835
Other Parts Discussed in Thread: DRV8848

Hi,

DRV8835 is to reduce motor starting current.

As a measure to reduce the motor starting current,
 we are considering changing the VM voltage (For example VM=3.0V → 7.0V).

1. Is this a problem as how to use DRV8835?

2. I can imagine that Ron of the built-in FET changes,
    Is it possible to think that when the motor starts up, when the VM is low(For example VM=3.0V),
    the current increases?

3. In addition to changing the VM, what is the best way to reduce the motor startup current?

best regards

  • 0
    TI__Expert 4435 points

    Hi Cafain,

    1. Is this a problem as how to use DRV8835?

    No, the DRV8835 is able to handle VM voltage up to 11V

    2. I can imagine that Ron of the built-in FET changes,
        Is it possible to think that when the motor starts up, when the VM is low(For example VM=3.0V),
        the current increases?

    Ron change would be minimal.  The start-up current will increase as the voltage increases.

    3. In addition to changing the VM, what is the best way to reduce the motor startup current?\

    To reduce motor start up current use PWM method and slowy increasing your duty cycle.

    Also, depending on your end application, there might be other suitable DRV devices which have current regulation features such as the DRV8848.

    Thank you. 

  • 0 in reply to Luis Riveros
    Mastermind 6755 points

    Hi, Luis-san

    I appreciate your prompt cooperation.

    best regards

    cafain