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Low Voltage Cutoff

crutschow

Well-Known Member
Most Helpful Member
According to my calculations, R6 would have to be a 40W resistor...
R6 is a dummy load representing the real load.
It isn't on the actual circuit.
It does not shut off until about 12V..
If you are using the circuit in post #13 then it should trip at about 17V.
If not, then you have a wiring error or an incorrect resistor value.
 

LukeKnepp

New Member
I made this board, and the first time it shut off at 16.1V.
I was like "YAY" :)

However, after that, it did not work again. :(
I took off the MOSFET and tested it. It does not work.

I tried this twice and have 2 non-working MOSFETs.

Does anyone know what is wrong?
 

crutschow

Well-Known Member
Most Helpful Member
What was the MOSFET load?
 

LukeKnepp

New Member
It was a 10k resistor, and that was only for a test, I was going to hook it up to my fan, but I certainly do not want to cause my fan damage.
 

crutschow

Well-Known Member
Most Helpful Member
I see no reason for the MOSFET to fail, unless there is a wiring error.
Sounds like the drain might be shorted to ground.
 

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