I am a young engineer and I need a help from you.
I need to design a driver circuit which must power-up a LED (OC) if the measured volatge is greater that 50V (Voltage to be measured can be upto 450V DC). The driver must take power from the measurement point.
As show in the circuit I put a voltage divider and voltage reference(TL) will be activated when the measured voltage is greater than 50V and it will drive the transistor which is gonna power up the LED.
The problem lies on the power supply to the transistor I need to have a collector Emitter volatge which can be used for LED power Up. So I put a zener diode regulation circuit (Break down volatge is according to the driver volatge requirment).
I want to make sure this is the perfect solution, is there any other feasible way to do this?. ( Because R13 is huge in power , is there any other way to limit the power requirment for this?- I need 2mA to drive the LED.
Thanks in advance