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.

TLV9161: output unstable if the intput is less than 100 mv, rail to rail operation

Expert 1030 points
Part Number: TLV9161
Other Parts Discussed in Thread: TLV9162, TINA-TI

Tool/software:

Hello experts,

We are trying to smulate the TLV9162 model given in https://www.ti.com/product/TLV9162 , usder "Design Tools & Simulation"

We tried a simple voltage follower with a non inverting input , giving it a sinosoidal input of 5 KHz grequency , with an offset of 1v and amplitude of 1v in single supply configurtion with V+ of 3.33v.

Notice that as the input approches near 0v(less than approx 100 mv) , the output gets unstable..

Could you kindly conform if we are violating the opamp parameters in some way.?

We tried the same curcuit with a supply of 15v with similar results

  • Hey AK,

    This is not the intended behavior. I believe there is an internal clamping structure that is causing this behavior. We will work to resolve this. In the meantime, I would try to keep the output voltage away from the linear range of the output stage. I believe in this model the worst typical spec was targeted, which was 85mV from V-.

    As another point, we do not support LTspice, and this model works somewhat better in TINA-TI (see below) where this behavior is only seen on the first instance of going outside of the linear output range.

    Best,
    Jerry