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DRV8301: DRV8301 internal Buck Converter function fail.

Kevin Huang8
Genius 4475 points
Part Number: DRV8301

Dear Sir/Ms.

The function of my customer DRV8301 is abnormal. After a simple analysis, it is found that the PH is short-circuited. It may be that the internal Buck Converter is burned out. But the customer's system is 12V, and the highest voltage is only 35V. The maximum voltage of DRV8301 is 60V. 35V is less than 60V. The customer would like to ask where protection components can be added to the circuit to avoid this phenomenon.

 

  • 0
    TI__Mastermind 21805 points

    Hello Kevin,

    Thanks for your question.

    What is the short on the PH pin to - i.e. GND or PVDD2?

    FYI - the buck converter is a TPS54160. Common ways to damage the buck would be ESD event on the input or output, or overcurrent in the buck output.

    Does the short occur inside the DRV8301 or on the PCB? Can you remove the inductor and schottky diode from the PH node to check if the short is still present on the PH pin? There could be some short on a circuit powered by the buck, and without isolating the PH node you would not be able to check.

    Thanks,

    Matt

  • 0 in reply to Matt Hein
    Genius 4475 points

    Hi Matt,

    Answer as below.

    Short on the PH pin to - i.e. GND

    Short occur inside the DRV8301

  • 0 in reply to Kevin Huang8
    TI__Mastermind 21805 points

    Hi Kevin,

    ESD or overvoltage would seem like possible causes to damage the PH pin of the buck.

    You should ensure that the external schottky is placed as close to the pins as possible, otherwise you may see short overvoltage events on PH while it is switching. Adding a TVS to the PH pin or buck output would help against ESD events.

    Thanks,

    Matt