Mosfet High Side Switch Circuit

While designing the ups circuits mosfet were used in the inverter circuits. For an n channel mosfet the source connects to ground and the drain connects to the negative side of the load. While you can use a jfet for this circuit an enhancement mode mosfet works better.

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The mosfets were used as high side switches in the circuit.

Mosfet high side switch circuit.

A circuit for a typical high side switch using a p channel mosfet is shown in fig. The opposite of the low side switch is the high side switch. I ve written a detailed tutorial regarding the use of ir2110. Usually a p channel will be configured as a high side switch as i show here.

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. Ir2110 is a high low side gate driver ic which is used with power mosfet and igbt. However it just comes down to the voltage difference between gate and source. 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.

Ir2117 for example is one driver that contains a single driver that can be used to drive a high side mosfet driver. 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. Just use an integrated high side switch something like auri3313 and a sot323 transistor and you have a high side switch with 10mohm 20a thermal protection short circuit protection for few. That s creating a low side switch.

N channel p channel 15. 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. 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.

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. 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. Notice the similarities and differences between figs.

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