voltage driven Analog switch

Hello,

I'm trying to make a voltage driven analoge switch such that the input voltage would trigger the switch when getting below or above a certain voltage.

I've found a few componant that were doing what I wanted (TS3A5018) but they generaly accept low current (100mA) while I work with current around (1A) I wanted to know if a simpler design would exist or if I could use the a componant like the TS3A5018 as a drive for higher current(but I don't really know how to proceed).

thank you,

by alternatif
October 29, 2021

The idea is to use a PMOS to break the circuit loop when the voltage at its gate get close to the voltage at its source, V1. And to use a NMOS to break the circuit loop when the voltage at its gate get close to its source, here, the ground. Otherwise, the current flows.

Note that in this simple basic circuit, it is possible to have both circuits working. The TS2A5018 makes that impossible with the help of a negation logic.

If you need to control a large current/voltage (V1), just choose the PMOS and NMOS appropriately. With the TS3A5018, you can tie one of its four outputs to a transistor. BJT are often used in that case, but a NMOS is easy to use too for that purpose. Doing so, it is this new transistor who see the large current/voltage, not the IC. That is the same idea that when you interface an Arduino or a Raspberry Pi, as example.

by vanderghast
October 29, 2021

Thank you very much, I'll look into that design.

I'm not very confortable with Mosfet I havn't work with them for a long time that is why I was trying to find simpler around.

by alternatif
October 30, 2021
Add comment...

Please sign in or create an account to comment.


No Answers

No answers yet. Contribute your answer below!


Your Answer

You must log in or create an account (free!) to answer a question.

Log in Create an account


Go Ad-Free. Activate your CircuitLab membership. No more ads. Save unlimited circuits. Run unlimited simulations.

Search Questions & Answers


Ask 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.


About This Site

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:

  • Concept or theory questions
  • Practical engineering questions
  • “Homework” questions
  • Software/hardware intersection
  • Best practices
  • Design choices & component selection
  • Troubleshooting

Unacceptable Questions:

  • Non-English language content
  • Non-question discussion
  • Non-electronics questions
  • Vendor-specific topics
  • Pure software questions
  • CircuitLab software support

Please respect that there are both seasoned experts and total newbies here: please be nice, be constructive, and be specific!

About CircuitLab

CircuitLab is an in-browser schematic capture and circuit simulation software tool to help you rapidly design and analyze analog and digital electronics systems.