I have part of a circuit that I wish to disable power to depending on two input signals (digital, active low). How do I realise this, preferably using transistors?
The two signals comes from a LiPo protection circuit representing over-charge and over-discharge. When either is low the rest of the circuit must be disabled to prevent battery damage and potential danger.
This is what I tried, using two N-channel enhancement mode MOSFETs. It works for one of the signals, but when input 2 is low, it does not fully turn of (LED is still lit). What the schematic software didn't allow me to do is that there is a diode between source and drain of the transistors, as in the second picture. An explanation to that would also be nice, as I have a feeling it affects the setup.
Example circuit (Vdd = 2.7 – 4.3 V)
Actual symbol of MOSFETs used