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General Technical Chat / Re: Relay trigger when voltage above 13v
« Last post by ledtester on Today at 04:37:36 am »Here is TI's app note on using the TL431 as a comparator:
Using the TL431 for Undervoltage and Overvoltage Detection
https://www.ti.com/lit/an/slva987a/slva987a.pdf
You might find it easier to use a real comparator - eg. a LM339 / 393 / etc.
Here is TI's app note on designing a comparator circuit with hysteresis:
Comparator with Hysteresis Reference Design
https://www.ti.com/lit/ug/tidu020a/tidu020a.pdf
Using the TL431 for Undervoltage and Overvoltage Detection
https://www.ti.com/lit/an/slva987a/slva987a.pdf
You might find it easier to use a real comparator - eg. a LM339 / 393 / etc.
Here is TI's app note on designing a comparator circuit with hysteresis:
Comparator with Hysteresis Reference Design
https://www.ti.com/lit/ug/tidu020a/tidu020a.pdf