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TPS22810: Can i use TPS22810 to drive a brush DC motor?

Kevin Chen
Intellectual 390 points
Part Number: TPS22810

Hi,

Can i use TPS22810 to drive a brush DC motor?   The motor work only one direction.

Best Regards

Kevin

  • 0
    TI__Mastermind 32650 points

    Hi Kevin,

    TPS22810 should not be used to switch on a DC motor as there is no integrated clamp that will protect the device during the inductive kickback phase when the Motor turns off.

    While we do have High Side Switches that are capable of safely driving inductive loads, these devices cannot be PWM'd with higher frequencies as you are limited by the turn on, rise and turn off times of this device.

    My recommendation would be to use a dedicated motor driver IC rather than a Power Switch for your application.

    http://www.ti.com/motor-drivers/overview.html

  • 0 in reply to Shreyas Dmello
    Intellectual 390 points

    Hi Shreyas,

    The DC motor already has a integrated clamp diode. And there is no need for PWM control with high frequency. The brush DC motor driver IC is too expensive for this use, so i need a cheaper solution.

    Best Regards

    Kevin

  • 0 in reply to Kevin Chen
    TI__Mastermind 32650 points

    Hi Kevin,

    TPS22810 is not meant to drive inductive loads and historically we do not recommend driving any type of motor or solenoid with load switches. We often recommend high side switches for solenoid loads. On the other hand, if you have a clamping circuit in place already the application may work.

    As long as you are not violating the specifications stated on the datasheet, the device will work. My suggestion is for you to order an EVM and try your use case out on a bench. I would further recommend looking at the switching waveform to confirm that the device is being run within the spec'd range. 

    Thank you for choosing TI Power Switches in your designs.

  • 0 in reply to Shreyas Dmello
    Intellectual 390 points

    Hi Shreyas,

    The problem TPS22810 drive inductive loads is  when the inductive load is switched, the transients will cause current to flow backwards through the body diode of the pass FET of the TPS22810. Even with flyback diode. I will add a diode series with TPS22810. Is any other problem with this circuit?

    Best Regards

    Kevin

  • 0 in reply to Kevin Chen
    TI__Mastermind 32650 points

    Hi Kevin,

    If you are okay with a diode drop in your circuit, I would move the diode to be between the source and the TPS22810.

    This would protect from reverse current through the FET and would also prevent reverse current from the GND plane in the case of reverse polarity (incorrectly connecting the source).

    During the turn off transient, the output rail will be pulled negative due to the inductive kickback. While the flyback diode will provide a dissipation path for the stored energy, I am slightly concerned that the voltage on the output will be pulled lower than recommended operating conditions. Out high side switch devices clamp the output voltage so that it does not reach these levels when turning off an inductive load. I do think testing may confirm if this is an issue in your situation or not.