Hi Guys
I am working on a small project where I need to Drive LED ON when the input voltage is between 23V and 25V. Turn OFF LED when the input voltage is <23V and >25V.
Do you guys have any suggestions? Apologies if the question has already raised elsewhere.
TIA

 

Welcome to AAC!
Googling "window comparator" will bring up some reference material for you.

 

Welcome to AAC!
Googling "window comparator" will bring up some reference material for you.

Thanks

 

This is a handy not to make a very simple comparator:
http://www.ti.com/lit/an/slva987a/slva987a.pdf

 

What else does the design have to do ?


Regards, Dana.

 

Yes, a window comparator should work for you.
You can use a LM339 or LM393 comparator (2 comparators in the package used), with a TL431 voltage reference for the levels.
Below is the LTspice simulation of an example circuit:
The LED D1 (blue trace) is on between 23V and 25V input (yellow trace).
How close to those values does the actual trip point need to be?

 

Yes, a window comparator should work for you.

From pure curiosity. Why did you use R5 = 4.99kΩ and R8 = 5kΩ?

 

From pure curiosity. Why did you use R5 = 4.99kΩ and R8 = 5kΩ?

Just laziness.
Both can be 5kΩ or 4.99kΩ to minimize part types.