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Original question:

DRV8833: Current regulation tolerance

DRV8833: Current regulation and OCP min values overlapping

Benny Ahlqvist
Prodigy 20 points
Part Number: DRV8833

Tool/software:

Hi,

For the current regulation the min value is stated to 160mV and the OCP to 2A. I assume these function has random behaviour against each other for a bigger sample size. So its unlikely that one device has both 160mV in the current regulation and 2A for the OCP? Can be calculated also what the probability is?

Best regards

Benny

  • 0
    TI__Mastermind 19350 points

    Hi Benny,

    Yes, current regulation and OCP operate independently of each other. The OCP will trip to protect the device at or above 2A (device depending). The load current is meant to be well below this threshold and is only in place to protect from high transient, inrush, or stall conditions. 

    The current regulation is set by a comparator which compares the voltage across a current sense resistor connected to the xISEN pins with a reference voltage (VITRIP). Yes, the min and max values are specified in the datasheet as +-20% of typical value. We don't have any data or formulas to calculate manufacturing variations. 

    The current regulation is done a bit different on this device compared to some of our newer motor drivers. Most of our newer motor drivers (like DRV8411A) regulate the current by setting a combination of a reference voltage (provided externally) and resistor. 

    Best,

    David