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TPS65131: BSW Pin during fault conditions

Part Number: TPS65131

Hello,

The device datasheet states that the device has both an internal current limit over voltage protection and a thermal shutdown protection. What the datasheet does not explicitly say is what happens to the BSW pin during a fault. If a fault occurs will the BSW pin turn off the PFET?

Thanks,

John

  • Hi John,

    Thanks for your question. Let me contact the expert for this part. You can expect a response by 11/4/19.

    Best,

    Grant

  • Hi Grant, 

    Thanks for the quick response. I am actually visiting the customer on Tuesday morning and would love to have the answer before then if possible. 

    Thanks,

    John

  • Hi John,

    In the event of a over voltage or thermal shutdown, BSW signal will indeed turn off the PFET. I also just verified that on an EVM.

    Kind Regards,

    Liaqat

  • Hi Liaqat,

    Thanks for the quick help and verifying this on the EVM! One other question I was wondering that I couldn't find in the datasheet is what the output structure of the BSW pin?The electrical parameters and the functional block diagram don't show whether it is a push-pull output or an open drain output. I was wondering if a pull-up resistor is needed on the BSW pin to ensure it goes high if it is an open drain output. My guess is no, since the EVM doesn't have one. 

    Thanks again,

    John

  • Hi Liaqat,

    Sorry for the second message another question came in from my customer. Adding my last post here, these are my current two questions:

    • What the output structure of the BSW pin?The electrical parameters and the functional block diagram don't show whether it is a push-pull output or an open drain output. If open drain, I was wondering if a pull-up resistor is needed on the BSW pin to ensure the output goes high when the pin is in a High Z state. The EVM doesn't show one.
    • Why is there a 100 ohm resistor in series with the VIN pin? Neither the datasheet or the EVM user guide explain this. Is it to filter noise coming into VIN? Is it to reduce input current for any conditions where the supply rails temporarily exceeds 6V? 

    Thanks,

    John

  • Hi John,

    A pull up resistor is not needed as the BSW signal is actively driven.

    The 100 ohm resistor is for filtering noise coupling into the Vin pin as you guessed it.

    Kind Regards,

    Liaqat