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DRV8821: What Vref to use

Part Number: DRV8821

I'm supplying the motors with 12V and logic with 3.3V, and my R_ISENSE resistors are all 0.3Ohms, same as the reference design. 
Can I just hook the VREF pins to 3.3V and let the overcurrent protection do the rest?
Using the given formula, that would give I_CHOP of 2.2A

Cheers

  • Hello, Henry,

    With 3.3V xVREF and 0.3ohm sense resistor, the I_CHOP would be 2.2A which is highter than the 1.5A minimum OCP current threshold. The motor driver may not work: DRV8821 runs at OCP before the current reach the setting value.

    So, please change xVREF setting to make the output current lower than 1.5A.

    Regards,
    Wang Li