How does a MOSFET switch work?

The two MOSFETs are configured to produce a bi-directional switch from a dual supply with the motor connected between the common drain connection and ground reference. When the input is LOW the P-channel MOSFET is switched-ON as its gate-source junction is negatively biased so the motor rotates in one direction.

Why MOSFET operates in both positive and negative gate voltage?

It’s because the difference in their construction depletion type mosfet has a channel between it’s drain and source made of the same material which the source and drains are made where as enhancement type does not. Take the p channel enhancement type Mosfet, voltage is applied across it’s drain and source.

How MOSFET is triggered?

In order to turn on a MOSFET, a voltage higher than the rated gate threshold voltage Vth must be applied to the gate. While in a steady on or off state, the MOSFET gate drive basically consumes no power. The gate-source capacitance of a MOSFET seen by the driver output varies with its internal state.

Is MOSFET bidirectional switch?

The MOSFET is a bidirectional device, from the point of view that the terminals called the ‘Source’ and ‘Drain’ can be interchanged.

When a positive gate voltage is applied to MOSFET it is said to operate in?

So for n-type enhancement type MOSFETs, a positive gate voltage turns “ON” the transistor and with zero gate voltage, the transistor will be “OFF”. For a p-channel enhancement type MOSFET, a negative gate voltage will turn “ON” the transistor and with zero gate voltage, the transistor will be “OFF”.

In which region MOSFET acts as switch?

According to an article: In order to operate a MOSFET as a switch, it must be operated in cut-off and linear (or triode) region. According to another article: MOSFET in saturation region is preferred to make it work as a switch.

Do MOSFETs conduct in both directions?

Can MOSFET conduct in both directions? – Quora. Mosfet’s can only conduct in one direction (which direction is dependent on the type, N-channel or P-channel.) The MOSFET is not strictly symmetrical and that’s why it will only conduct in one direction.