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DRV8256: Peak current

FRANK1
Expert 8555 points
Part Number: DRV8256

Hi sir,

The datasheet of the product mentions a 5A peak current while the webpage mentions 8A.
Which one is the correct value?

Also is there any information available about maximum continuous current? The datasheet isn't clear to me about it.

Thanks.

  • +1
    TI__Mastermind 37683 points

    Hi Frank,

    The current peak current rating is 8-A which is the minimum over-current protection limit. So if the current is above this limit for a set duration of time (2µs), the device will go into protection mode.

    However, adjusting VREF voltage can set the current regulation limit (NOT the same as over-current limit) to any current value. This is done to prevent the current from going above a set limit during motor start-up or stopping events. The 5-A peak limit specified in the datasheet is the current limit when VREF=3.3V which is the maximum recommended value for VREF. However, VREF has an absolute max voltage of 5.75V. Setting VREF to 5.75V will give the 8-A absolute max peak current value. So the 5-A rating is the recommended maximum but the device can handle up to 8-A peak currents.

    In regards to the maximum continuous current. We don't specify this value because it is heavily depended upon PCB layout, operating ambient temperature, PCB material, and other factors. The biggest limitation of the continuous current will be heat dissipation.