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Hi,
I need voltage monitor with LED indication for monitoring 24V battery.
When the battery voltage drops below 18V the LED should get ON.
I referred TL431 in fig.26 of attachment.
My doubt is, how to calculate Vref? Is this fixed 2.5V or something else...
Kindly guide me on choosing resister also.
Regards
Jayamohan.M
Jayamohan,
Vref will be 2.5V in the equations.
Because you only need a low indication, use can use just 1 TL431 plus some other components.
Attached is a lightly tested, design using TI-Tina (free application)
