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DRV103: DRV103 Damaged

matt corcoran
Prodigy 30 points
Part Number: DRV103

Hello,

I am driving a 13V 13.2 ohm rotary solenoid using the DRV103.

My circuit is built on a surface mount prototype board. I do not have the thermal pad connected.

I was able to get the circuit working for a few times, but now when I apply power it drives the solenoid without the use of the switch on the Input pin.

The Status OK Flag is constantly low.

I believe that the part is now damaged which I did not think possible.

Are these symptoms of a damaged part?

Thanks,

Matt

 

  • 0
    TI__Genius 10855 points

    Hey Matt, 

    Can you provide a schematic or more information about your design? It would help in diagnosing where the possible damage occurred. 

    I'm also wondering if you included the flyback diode in parallel to the load. The flyback diode is used to help with transient inductive kickback from the load. Without the flyback, this could've caused damage to the DRV103.

    Thanks,

    Arthur Huang

  • 0 in reply to Alpha H
    Prodigy 30 points

    Arthur,

    Thanks for the quick reply.

    The schematic is attached.

    MattSCHEMATIC1 _ PAGE1M.pdf

  • 0 in reply to matt corcoran
    TI__Genius 10855 points
    Hey Matt,

    I took a look at the schematic and it looks good, but I'm still curious about the flyback diode in your configuration. We recommend using a schottky diode for the flyback diode, which helps prevent negative transient inductance from the load. Since the DRV103 only supports up to -0.2V, the schottky helps to prevent the output from damaging the internal components.

    You could try measuring the resistance from pins 4 and 5 on your schematic when the load is on/off. Check if there's a short between pin 4/5 when the device is powered and no enable. If so, then we can assume that the internal FET is damaged. I would also recommend trying this test with another DRV103 and comparing the results.

    Let me know if you have any questions,
    Arthur
  • 0 in reply to Alpha H
    Prodigy 30 points
    Arthur,
    Thanks. I found that the diode had a bad connection. I replaced it with a schottky and it keeps working.