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DRV8701: Motor drivers forum

Part Number: DRV8701

hello team,my DC motor driver  can drive and the functions(forward,backwards,slow,fast) are well but if I put a small load on it(improve the current slowly)it can run on 3A+ current but if I give it full pwm and hold  the motor,the motor doesn`t have force (if I let it go it could keep going)  i didn`t  open the OCP  this is my schematic .thank you !

  • Hello,

    If you check the state of nFAULT pin, is there a fault (nFAULT goes to 0 volts) when the load is applied?  What is your power supply?  Bench or battery supply?  Make sure your supply can deliver the current you need.  

    I would also increase the bulk capacitor on your VM line.  Add additional 100uf-220uF electrolytic to keep supply stable.

    Regards,

    Ryan