• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 50 subscribers
  • Views 230 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

General Purpose Opamp STG Protection

AlexWalton42
Expert 4550 points
Other Parts Discussed in Thread: TLV271

I have an application where I am sending a signal from a PWM DAC off board. The circuit consists of a PWM source followed by a 2nd Order Sallen-Key LPF. I am wondering what will be the result if a short to ground occurs, and how I can protect the opamp if a short to ground does occur. The opamp I am using is the TLV271.

Note signal coming out of LPF will be 0-1.4VDC.

I’d greatly appreciate any assistance!

  • +1
    TI__Guru*** 140666 points

    Hello Alex,

    As drawn the TLV271 output current with 3.3V supply won't be high enough to damage the device with a short to ground. So nothing has to be added.  Is there a chance for short to power?  

    I suspect that there is a chance for ESD or EOS surge. This will help with with ESD / EOS, but not short to power because the diodes could be damaged. This also lowers short to ground current.

  • +1
    Guru 140200 points

    Hi Alexander,

    I would add a 100R resistor in series to the output Relaxed

    Kai