I have a PFET in series with the high side of a Battery. I have an external signal that will come in and go anywhere from 0 - 60V. I want that signal at ~2V to turn on the MOSFET. I will use an NPN transistor most likely here. Now for the ugly piece. Once the PFET connects the battery to the circuit I don't want any other edge of the external signal to turn off the NPN. That is to say the external trigger signal 'could' drop below 2V due to a loading surge thus toggling the NPN to shut off. Basically I want to latch the rising edge of the external signal at 2V and bootstrap my battery on and never have to worry about any more edges from the external signal.
Any ideas on how to do this???
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