Pmos High Side Switch Circuit

N channel p channel 15.

Pmos high side switch circuit.

Now this is the same circuit but the gate is connected to ground instead of 5 volts. The voltage input though can handle voltages from 1 1 to 3. The mosfets were used as high side switches in the circuit. This voltage means the mosfet is turned off or an open.

The low side driver can be used to drive the low side mosfet of a boost converter. A high side p channel mosfet and a low side n channel mosfet tied with common drains figure 5 make a superb high current ªcmos equivalentº switch. Look at the voltages in this high side switch configuration. Ir2110 is a high low side gate driver ic which is used with power mosfet and igbt.

The ucc27200 1 is designed to drive both high side and low side switches. So the vgs in this case is 0 volts. A simple high side load switch circuit from nxp the nx3p190 integrates a p channel mosfet along with the level shifting and slew rate control circuitry. A gate driver is a specially designed circuit that is used to drive the gate of mosfet or igbt in high side switching.

In this instance the mosfet switch is connected between the load and the positive supply rail high side switching as we do with pnp transistors. That means the vgs is 5v 5v 0v. The mosfet can support more than 500 ma of continuous current with an on resistance of 95 milliohms at a supply voltage of 1 8 v. Ucc27200 1 shown in fig.

This tutorial will explore the use of a p channel and n channel mosfets as a power switch and general transistor theory. A useful circuit to have in designer s toolbox is the high side switch. This is for use with 5 volt micro controllers such as arduino. Like it sounds this is a circuit that switches the high side or positive voltage to a load.

An external capacitor and diode provides the bootstrap circuit for the high side mosfet used in a buck converter. This switch will operate on the positive side of a power supply with a negative common. The gate is now at 5 volts. In a p channel device the conventional flow of drain current is in the negative direction so a negative gate source voltage is applied to switch the transistor on.