In a high voltage application (30-40V) am looking to drive a high side MOSFET which is sometimes required to be some for considerable amount of time (hours or days). [Edit] It is shown in the block diagram below.
If I've understood correctly a bootstrap driver for a NMOS won't work in this case, right? Are there any other ways for driving high side NMOS which would require at times to be permanently on?
What about PMOS driver? When switching off it needs to connect to the supply voltage but for turning off its gate needs to be supplied around 10V below the supply voltage since connecting to GND will exceed the Vgs limit. Any idea how to do this? Any commercially available IC? Thanks a lot!
Edit: The circuit shown below works for switching a high side PMOS, albeit with some power loss and not at high frequency. If anyone knows any way to achieve higher frequency (100kHz), please let me know.