High Side Mosfet Switch Circuit

A circuit for a typical high side switch using a p channel mosfet is shown in fig.

High side mosfet switch circuit. Firsly in fig 4 6 13 the resistor r4 whose purpose is to discharge any remaining potential on the gate at switch off is now connected to the positive supply rail instead of to ground. 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. For driving the mosfet in high side configuration ir2110 gate driver ic was used. 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.

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. Drive circuits for the high side switches are called high side drivers and are more complicated than low side drivers because of the required voltage translation to the supply and because it is more difficult to turn off a floating switch. Yes but there are issues. I ve written a detailed tutorial regarding the use of ir2110.

The opposite of the low side switch is the high side switch. Ir2110 is a high low side gate driver ic which is used with power mosfet and igbt. While designing the ups circuits mosfet were used in the inverter circuits. N channel p channel 15.

For an n channel mosfet the source connects to ground and the drain connects to the negative side of the load. Notice the similarities and differences between figs. While you can use a jfet for this circuit an enhancement mode mosfet works better. The n channel mosfet of a buck converter is a high side switch.

This transistor connects between v and the load. Ir2117 for example is one driver that contains a single driver that can be used to drive a high side mosfet driver. Ir2110 which is arguably the most popular high low side mosfet driver features a high side driver and a low side driver in a single device. The mosfets were used as high side switches in the circuit.