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TS12A4516: Seeing an issue in production

Darren (FAE)
Expert 5483 points
Part Number: TS12A4516

My customer is using the TS12A4516 (DBV) in a design. I attached an image showing the implementation (internal link)

They are going to production now, but have been seeing a 2~3 issues a month - and finally think they found the cause.

They do a final operation check before shipping - and during these tests, they see a fault.

The fault seems to happen because the TS12A4516 does not properly connect the output COM to NC, and the processor looking at the NC detects the open-state. The High-Voltage supply should be turned on, and supplying power to the load, but because the switch isn't connecting COM to NC, this isn't detected.

Take a look at the image, and let me know if there are any concerns with the setup, or something specific to the device that needs to be taken into consideration.

Thanks,

Darren

  • 0
    TI__Mastermind 46607 points

    Hi Darren,

    The diagram itself has one thing that sticks out to me. This is the resistor divider from the high voltage supply - is there ever a time where a transient could cause pin 1 to go above (V+) + 0.3V? 

    The reason I think this might be the cause is because a switch not connecting properly usually is a sign of damage and the issue seems to be transient - i.e. normal operation isn't causing the issue. This device doesn't have many extra protection features that will prevent damage during transients. I am not 100% sure if this is the issue as it seems the voltage divider drops the voltage down to a pretty low level - but that is the only thing that sticks out to me.

    Has the customer removed the IC and test it is working by itself? 

    Are there transients on the HI-V supply, and if so do you know what ranges they are?

    Please let me know  so I can help you get to the bottom of these failures!

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    TI__Expert 5483 points

    I have some updates from the customer, but this is classified details/information, so I will follow-up offline.

    Regards,

    Darren

  • 0 in reply to Darren (FAE)
    TI__Mastermind 46607 points

    Hi Darren - I am going to set this thread to closed and work with you offline.

    Best,

    Parker Dodson