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DRV8262: IC Short circuit proetction

Shubham S
Prodigy 50 points
Part Number: DRV8262

Tool/software:

Hi All,

We have made a DC Motor driver using DRV8262. Sometimes, when we turn ON 48V VM signal through battery, we have observed that the IC gets damaged. We are wondering why does it happen, as it doesn't happen always, we tried to fix it by lowering the VM Electrolytic Capacitor, connected MOV and still the issue remains sometimes. I am sharing schematic of DRV part, welcome the suggestions on protection of the IC.

regards,

  • 0
    TI__Mastermind 23431 points

    Hey Shubbam,

    Can you try to take a scope capture of this happening? I suspect an overvoltage event is occurring.  Set your scope probe to monitor VM somewhere near the VM pin of the motor driver preferably.  Set the scope capture to trigger rising edge at 65V as the device might get damaged beyond this point.

    I see 100uF of bulk capacitance - you might want to try doubling this to help reduce the VM voltage rising.  

    Do you have a PWM ramp or acceleration on the input signal?  Instead of setting INx from 0 to 1 instantly, try PWMing it from 0% to 100% over 100ms (for example) to slowly accelerate the motor instead.  

    And would you mind posting some pictures of damaged devices, or describe the damage? Is the device visibly damaged or just not functioning any more?  And does this happen when it starts spinning the load or just on immediate powerup of 48V applied, even before you start spinning a motor? 

    Best,

    Jacob