Pmos High Side Switch Circuit

A useful circuit to have in designer s toolbox is the high side switch. One fault common to such circuits has been the excessive crossover current during switching that may occur if the gate drive allows both mosfets to be on simultaneously. 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.

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This is for use with 5 volt micro controllers such as arduino.

Pmos high side switch circuit.

This switch will operate on the positive side of a power supply with a negative common. This voltage means the mosfet is turned off or an open. Like it sounds this is a circuit that switches the high side or positive voltage to a load. Now this is the same circuit but the gate is connected to ground instead of 5 volts.

The source is also at 5 volts. 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. An external capacitor and diode provides the bootstrap circuit for the high side mosfet used in a buck converter. So the vgs in this case is 0 volts.

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. 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. A gate driver is a specially designed circuit that is used to drive the gate of mosfet or igbt in high side switching. Ucc27200 1 shown in fig.

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. The mosfets were used as high side switches in the circuit. The voltage input though can handle voltages from 1 1 to 3. N channel p channel 15.

Look at the voltages in this high side switch configuration. For driving the mosfet in high side configuration ir2110 gate driver ic was used. That means the vgs is 5v 5v 0v. The gate is now at 5 volts.

This tutorial will explore the use of a p channel and n channel mosfets as a power switch and general transistor theory. The low side driver can be used to drive the low side mosfet of a boost converter. The ucc27200 1 is designed to drive both high side and low side switches. Ir2110 is a high low side gate driver ic which is used with power mosfet and igbt.

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