Mosfet High Side Switch Circuit

Notice the similarities and differences between figs.

Mosfet high side switch circuit.

However it just comes down to the voltage difference between gate and source. A circuit for a typical high side switch using a p channel mosfet is shown in fig. 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. N channel p channel 15.

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. That s creating a low side switch. 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. 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.

My logic is that since it is a series circuit the mosfet should handle the current whether the load was in the source or in the drain. While you can use a jfet for this circuit an enhancement mode mosfet works better. Ir2117 for example is one driver that contains a single driver that can be used to drive a high side mosfet driver. Ir2110 is a high low side gate driver ic which is used with power mosfet and igbt.

Usually a p channel will be configured as a high side switch as i show here. This transistor connects between v and the load. 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. 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. For an n channel mosfet the source connects to ground and the drain connects to the negative side of the load. The mosfets were used as high side switches in the circuit. While designing the ups circuits mosfet were used in the inverter circuits.