booboojerkers
Newbie level 3
Hello!
Excuse my ignorance but I was reading about Photovoltaic Generators used as FET drivers, and the implication appears to be that operation only requires an initial pulse signal to drive a FET Vth on, with the PVI driver having it's own floating voltage source to manage the FET Vgs threshold. Is this correct?
It's hard for me to wrap my thought around this because I am used to thinking of a FET as a switch having a constant voltage at its gate in order to turn it on, which seems to occur in the PVI, correct? See one of the app notes I read on this: IR's AN-1017. I would like to create a Solid State Relay and the PVI seems to be a great choice as it only requires the current source signal to initiate the PVI to drive the gate, but its hard for me to accept that the FET can be "latched" on by a single pulse signal from the PVI and "stay on" like a mechanical relay. I seem to want to think that the independent voltage source of the PVI on the Vgs would eventually dissipate.
Just trying to get to a better understanding of how this device works.
Thanks!
Excuse my ignorance but I was reading about Photovoltaic Generators used as FET drivers, and the implication appears to be that operation only requires an initial pulse signal to drive a FET Vth on, with the PVI driver having it's own floating voltage source to manage the FET Vgs threshold. Is this correct?
It's hard for me to wrap my thought around this because I am used to thinking of a FET as a switch having a constant voltage at its gate in order to turn it on, which seems to occur in the PVI, correct? See one of the app notes I read on this: IR's AN-1017. I would like to create a Solid State Relay and the PVI seems to be a great choice as it only requires the current source signal to initiate the PVI to drive the gate, but its hard for me to accept that the FET can be "latched" on by a single pulse signal from the PVI and "stay on" like a mechanical relay. I seem to want to think that the independent voltage source of the PVI on the Vgs would eventually dissipate.
Just trying to get to a better understanding of how this device works.
Thanks!