As i said, i dont have a negative supply.The MOSFET will stay ON (closed) as long as the gate-source voltage is at or above the value given in its data sheet for the minimum Rds on-resistance.
This is typically -10V for a standard P-MOSFET.
It's the gate-source voltage, Vgs, that matters.As i said, i dont have a negative supply.
So if the source = 0V and the lowest voltage i have is ground then 0-0 = 0
Hence my question.
Again, if there is 0 V from source-to-drain, what does it matter whether it is closed or not? No current will flow in either case.There is no circuit to post. I am wanting to treat a PFET like a solid state relay.
I want it to stay closed for a very particular reason. It has to do with something much more complex from a transient standpoint.
Just trying to explore if there is a way to make a PFET stay closed with 0v from S->D without a negative supply.
Again, what is the purpose of using a PFET for this purpose?I am wanting to treat a PFET like a solid state relay.
Not if the gate is also at 20 V.If there is 20 volts on the source and drain then the FET is already ON.
Hello, Mike. Try googling "high side pFet".Is there a way to use a P channel fet like a switch and hold it closed even when there is 0V across it?
Was trying to think of how to do that without a bipolar power supply.
I only have a single available.
Anyone have any ideas?
If I'm understanding you correctly, you'd like a circuit that would "latch" its state even if voltage to the pFet is removed?
OK . . . how is that supposed to work? I probably missed something here, but . . . The most basic solid state latch + power switch requires two transistors, and transistors need electrical energy to function. Other than a flash memory cell, how is the latch state to be remembered without power?Correct that is a good way to think of it.
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