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Applications Of Mosfet




The MOSFET is an important element in embedded system design which is used to control the loads as per the need. Many of electronic projects developed using MOSFET transistor such as light intensity control, motor control and max generator applications. The MOSFET is a high voltage controlling device provides some important features for circuit designers in terms of their overall performance.
MOSFET and Its Applications
The MOSFET (Metal Oxide Semiconductor Field Effect Transistor) transistor is a semiconductor device which is widely used for amplifying electronic signals and switching in the electronic devices. The MOSFET is a three terminal device such as gate, source, and drain. The MOSFET transistor is very far the most common transistor and can be used in both analog and digital circuit.

The mosfet transistor works by varying the width of a channel along which charge carriers flow (electron and holes). The charge carriers insert into the channel from the source and exits through the drain. The channel width is controlled by the voltage on an electrode is called gate which is located between the drain and source. It is insulated from the channel near very thin layer of metal oxide. There is a different kind of MOSFET applications which is used as per the requirement.

Types of MOSFET Devices
The MOSFET transistor is divided into two types which is given below :
Depletion mode MOSFET 
When there is zero voltage on the gate terminal, the channel shows its highest conductance. As the voltage on the gate is positive or negative then decreases the channel conductivity.
Enhancement mode MOSFET
When there is no voltage present on the gate terminal the device does not conduct. More voltage applied on the gate terminal, the device has quite good conductivity.
MOSFET Applications
The applications of the mosfet transistor used in various kinds of electrical and electronic projects which are designed by using various electrical and electronic components. For better understanding of this concept, here we have explained a project in which MOSFET is used as a switch.

MOSFET Used as a Switch
In this given circuit, using enhanced mode, the N-channel MOSFET is being used to switch the lamp for ON and OFF purpose. The positive voltage is applied at the gate of the MOSFET  transistor and the lamp is ON (VGS =+v) or at the zero voltage level the device turns off (VGS=0).    If the resistive load of the lamp was to be replaced by an inductive load and connected to the diode or relay to protect the load. In the other circuit, it is a very simple circuit for switching a resistive load such as lamp or LEDs. But when using MOSFET to switch either capacitive load or inductive load protection is required to contain the MOSFET applications. If we are not giving the protection, then the MOSFET transistor will be damaged. For the MOSFET to operate as an analog switching equipment, that requires to be switched between its cutoff region where VGS =0 and saturation region where VGS =+v.





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