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DRV8231A: Need help debugging DRV8231A Circuit

David Wurmfeld
Prodigy 20 points
Part Number: DRV8231A
Other Parts Discussed in Thread: DRV8231,

Driving a 12V geared motor (100:1 Metal Gearmotor 20Dx44L mm 12V CB) in a configuration to push paper.

We have used this configuration for over 40,000 cycles without an issue.

On the first production unit the motor overheated (a little over 110 degrees F), the overcurrent flag was raised (no actual values) after a hundred pages and slowed to a crawl.

The output was:

 

Circuit: FY1, FB1, FB2 used to reduce EMI signature.

VM = 12V.

3.3V logic.

Any Ideas how I might do a post mortem on the driver board? 

  • 0
    TI__Genius 12460 points

    Hi David,

    It is surprising that the same configuration was successful during testing and overheated during production. The DRV8231 offers internal features that such as supply voltage undervoltage lockout, output overcurrent, and overtemperature to protect the device in such cases.

    In order to understand the issue more fully could you please provide answers to the following:

    After the motor overheated, is the DRV8231A still functional?

    Were the output waveforms taken before or after the motor overheated?

    In the output waveforms, is the top picture the output voltage and the bottom nFAULT?

    Do you know the load of the motor and how much current was being drawn?

    Best,

    David