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DRV8313: DRV8313 Output Current Capabilities

Part Number: DRV8313

Hi,

In the datasheet , features says the current drive capability is 2.5A Peak.

In the Block diagram it's 3.5A.

I am bit confused could you please confirm the Current drive capability of DRV8313.

Thanks,

Arif 

  • Hello Arif,

    Sorry for the confusion. This datasheet has some inconsistencies for peak current capability.

    For any motor driver you can always confirm the real peak current capability by looking at the overcurrent protection specification. In the DRV8313 datasheet you can find this in the Protection Circuits section of the Electrical Characteristics (copied below).

    The minimum overcurrent protection trip level is 3A, which would be the worst case for any part that you can find. You can also see that an average part has an overcurrent trip level of 5A, indicating that an average unit may allow for higher peak current.

    For further information, see the TI Precision Labs - Motor Drivers: Peak vs. RMS Current

    Thanks,

    Matt

  • Thanks Matt,

    Could you please also confirm, when a PWM signal is applied to INx pin that only the high side FET of that channel will turn on and off and the low side FET will only turn on if the INx pin is constantly low.

    Thanks in advance,

    Arif

  • Hi Arif,

    Whenever ENx is high and INx is Low the low-side MOSFET will be ON (see the table below)

    If you apply a PWM signal to INx (and ENx is high) the output will switch back and forth from high-side ON to low-side ON.

    If you want to PWM by only turning the high-side MOSFET ON and OFF, apply the PWM signal to the ENx pin while INx is held high.

    Thanks,

    Matt