P Mosfet High Side Switch

This transistor connects between v and the load. That only explains why you used a p mosfet as a high side switch but not the the reason why a high side switch is useful. N channel mosfets have lower on resistances than p channel mosfets so are preferable if you have the choice of which side to switch.

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Sometimes you want to keep the same ground reference to your circuits so.

P mosfet high side switch.

To switch v with a p channel mosfet. N channel mosfets can also switch v in certain configurations with drain being vin and source being switched vout. Using a p channel with positive voltages is easy when connected to the circuit correctly. If your load voltage is higher like 12 or 24v then you might want to use an n channel mosfet in a low side configuration.

Then the p channel mosfet is used to switch the positive supply to the motor for forward direction high side switching while the n channel mosfet is used to switch the negative supply to the motor for reverse direction low side switching. Used as a high side switch a p channel mosfet in a totem pole arrangement with an n channel mosfet will simulate a high current high power cmos complementary mos arrangement. Because of how transistors work these can be a little more difficult to use in an arduino or raspberry pi circuit. In this case use a p channel mosfet to turn the relay on from the arduino s i o pin.

Although the p channel mosfet cannot complement the n channel in both on resistance and capacitance simultaneously such combinations as the low threshold p channel. It seems like every time i go to work with mosfets i have to spend. The p channel high side switch therefore solves the problem of using an n channel mosfet for high side switching. There are a variety of configurations for driving the two mosfets with many different applications.

The mosfet used in the this high side switch is a logic level 4p03l04 from infineon and as it only needs its gate to be 4 5v lower than the 12v supply the 12vpp waveform applied to its gate easily switches the mosfet on or off. It s a simple circuit that has a input for positive and negative and an output for positive and negative connections. Typically these use a pnp bjt or p channel mosfet. Here s my schematic and board design for a simple high side switch using a p channel mosfet.

The opposite of the low side switch is the high side switch.

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