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A PMOS switch is easier, because you don't have to drive
the gate outside the rails (load=VIN, Vgg = VIN+VT+overdrive).
If you have the aux supply, then this is an op amp controlled
gate (or simple RC, the NMOS acts as source follower until
the pass FET goes linear).
(or simple RC, the NMOS acts as source follower until
the pass FET goes linear).
Hi :
I use a NMOS switch.
I studied some documents, but none explain the principle of the simple RC for slew rate controll.
Could you explain this circuit if possible ?
Thank you very much.
"Current Available to charge Capacitor" is the definition of Slew rate. NMOS switch or PMOS switch should be able to drive high current. NMOS switch have higher mobility but PMOS passes high voltage without drop. according to application you can choose anyone.
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