|
Hi, I have designed a Non inverting comparator circuit with LM2901. The inverting input has 0.5V as Vref through a potential divider. The non inverting input is the signal input, which has 10K input resistor and a 390K feedback resistor to get 100mV hysteresis. The output has a 10K pull up and it is connected to a IO expander PCA8575 through a 0 ohm resistor. I am seeing a strange behavior of the comparator output. During power up, if the +input is 0V then the output is stuck at low. after power up, the change in the +input higher than Vref is not changing the state. However if the input is higher than Vref at the power up then the output is toggling high and low as expected. Can anyone help to explain what is happening here, and how to solve this issue? |
December 11, 2021 |
|
Hope this would help you, you can find the LM2901 datasheet here: https://www.easybom.com/p/lm2901d-texas-instruments-3420391 |
December 21, 2021 |
No answers yet. Contribute your answer below!
You must log in or create an account (free!) to answer a question.
Anyone can ask a question.
Did you already search (see above) to see if a similar question has already been answered? If you can't find the answer, you may ask a question.
CircuitLab's Q&A site is a FREE questions and answers forum for electronics and electrical engineering students, hobbyists, and professionals.
We encourage you to use our built-in schematic & simulation software to add more detail to your questions and answers.
Acceptable Questions:
Unacceptable Questions:
Please respect that there are both seasoned experts and total newbies here: please be nice, be constructive, and be specific!
CircuitLab is an in-browser schematic capture and circuit simulation software tool to help you rapidly design and analyze analog and digital electronics systems.