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DRV8844: High ratio damage for DVR8844...

Peter Tseng
Mastermind 6180 points
Part Number: DRV8844

Dears,

My customer design with DRV8844 for their product but found DRV8844 damaged often.

Attached is the schematics.

The PW1 is 48V~50V.

Can you help to review it and give me some idea for modification?

Thanks.

sch.pdf

  • 0
    TI__Guru** 114905 points

    Hi Peter,

    How many failures have been seen?

    Out of how many tested?

    Are IN1 and IN2 being PWM'ed? If so, at what frequency?

    Is the damage seen at all three locations? If only one location, please check the layout carefully.

    Please ask the customer to check for voltage spikes at VM when operating the motor. The device can be damaged if VM to VNEG exceeds 65V. This could occur if the motor is stopped suddenly. A quick check is to operate the system at 24V if possible and watch for voltage spikes.

  • 0 in reply to Rick Duncan
    TI__Guru 56650 points

    Peter,

    Let me temporary close this post since no update is posted. You can reopen it by posting the update.