![]() ![]() If that is so why advertise PMOS's as "logic level gate" ( Digi-Key) when with common logic levels i wont be able to use it properly on high voltages(or currents). Now thats not ideal since the the highest i can run it with my 5v logic is 20v way below its rated 80v. Now at logic 5v high my mosfet will probably gget destroyed because the voltage at the gate (referenced to source) will be -45v which is waaay past the +- 20. PMOS on the other hand Works the same As NMOS but when used as a typical high side switch the Source pin is not connected to ground but to Vcc!. ![]() (Again correct me when im wrong about something) So no matter what voltage that im switching the mosfet will turn on and off with my logic singal. When both used as a switch the NMOS is pretty much staight forward, because NMOS is typically used as a low-side switch a logic-level NMOS like mention above will always turn on at logic 5v HIGH because the gate pin is referenced to the SOURCE pin which is connected directly to ground(which the Logic ground is also referenced). I have always this mindset that to drive a MOSFET you have to apply a certain voltage to the gate of the mosfet to turn it "on" But it would seem that it not entirely true, you have to apply a certain voltage into the gate with reference to the source pin not necessarily the ground pin (correct me if im wrong).įor situations stated below i will use the two ADVERTISED as LOGIC LEVEL MOSFETS the BUK9134(NMOS) and FDS8935 (PMOS) ![]()
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