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TLV3011-EP: Output pin pulled beyond Supply

Art Mecina
Genius 16655 points
Part Number: TLV3011-EP
Other Parts Discussed in Thread: TLV3011

Hello Guys,

Our customer have tied the outpun pin of TLV3011-EP to a supply of 13V. His implementation is currently working, but will this eventually damage the device? 

Here is his connection.

Appreciate your inputs on this!

Art

  • 0
    TI__Guru 60786 points

    Hi Art,

    No. This is not good. The TLV3011 is a 5.5V max device.

    Even if the TLV3011 allowed the output to be pulled above the comparator V+, it would only be up to 5.5V due to the process, and not 13V.

    Most likely the output is diode clamping to the 5V line (what do you measure at the comparator output? Around 6V?).

    Apparently the output is just "high" enough to satisfy the regulators logic threshold.

    A zener clamp to ground can be added to the comparator output to limit the "high" to <5V.

    Or a 5.6k to 6.2k resistor can be added from the comparator output to ground to create a voltage divider along with the pull-up resistor. It will still go "low" around zero but the resistor or diode will limit the comparator output voltage.

    If the full 0 to 13V is needed for the regulator, then an external transistor will need to be used (and input logic inverted).


  • 0 in reply to Paul Grohe
    TI__Genius 16655 points

    Hi Paul,

    Thank you for confirming this.

    I will set this ticket to resolved now. In case customer have further clarification, I will let you know.

    Art

  • 0 in reply to Art Mecina
    TI__Mastermind 25990 points

    thanks Art, we will close the post for now.

    Chuck