What is high-side and low-side switch?
The low-side switch is switching ground while the high-side switch is connecting the voltage supply. Generally in a circuit, you want to keep the ground connected and switch the power.
What is high-side MOSFET driver?
“High-side” means the current travels from the supply through the mosfet to the load and then to ground. Another way to put that is: Low-side = mosfet source to ground, drain to load, load to supply. High-side = mosfet drain to supply, source to load, load to ground.
How does a high-side driver work?
A low-side driver is placed between the load and ground, whereas a high-side driver, shown in 2(b), is placed between the load and the supply voltage. The low-side driver is often used for powertrain-related loads such as motors, solenoids, and heaters.
Is there any way to modify a p-channel MOSFET high side switch?
I am trying to reduce the power dissipation of a P-Channel MOSFET high side switch. So my question is: is there any way in which this circuit can be modified so that the P-Channel MOSFET will always be “fully-on” (triode / ohmic mode) no matter what the load is?
Is there a way to toggle the pMOSFET fully?
From what I think you are trying to do, you may find you might not be able to toggle the PMOSFET fully, or you may have some difficulty unless you understand the datasheets properly. What may be an easier idea, is to use a MOSFET pair, where you toggle an N-channel MOSFET to pull the gate of the P-channel to 0V, like so:
Why are MOSFET switches used in CMOS circuits?
MOSFET’s make very good electronic switches for controlling loads and in CMOS digital circuits as they operate between their cut-off and saturation regions.
How does gate voltage affect the RDS of a PMOS?
For a PMOS the lower the gate voltage, the lower Rds (as Russell points out, higher absolute Vgs). This means in this case the input signals lowest point will cause the highest Rds (if it’s an AC signal) Use a 4-lead MOSFET (so you can bias substrate separately from source) so signal voltage does not affect the Rds.