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DRV8703-Q1: Regenerative protection

Deepakji
Intellectual 300 points
Part Number: DRV8703-Q1

Hello,

I am using the DRV8703-Q1 to drive a 100W/24V PMDC brush motor, using a full H-Bridge. The application is such that, it can cause the motor to spin in the reverse direction, effectively making the motor a generator. This can happen when the motor is being actively driven, and also when the whole circuit is powered off. 

In both these cases the DRV8703-Q1 gets damaged followed by the rest of the digital circuit. Following is the schematic. Please let me know what can be done to protect the DRV8703 and the rest of the circuit in such a case. 

PS: The board has three such H Bridges connected to 3x 100W motors. So the problem gets compounded 3x times on the actual board. 

 

  • 0
    TI__Guru** 114905 points

    Hi Deepakji,

    Typically this type of issue is due to a violation of the absolute maximum voltages of the device.

    If possible, can you attempt to slowly spin the motor when the device is powered off. If you can, please measure the voltages around the DRV8703-Q1. This should provide a clue.

    Then raise the speed of the motor further and look at the difference in voltages.

    Please continue until you begin approaching the abs max of the device.

    Please report the speeds and voltage measurements above, plus the speed of the motor during the original tests.

    With this information, we should be able to assist further.