MOS transistor in controller: working principle and application

MOS transistor in controller: working principle and application

MOS transistor is a common Field-effect transistor, which is often used in the circuit of controller. It has the characteristics of high-speed switching, low conduction resistance, and low driving voltage, so it is widely used in controllers. This article will introduce the working principle of MOS transistors and their applications in controllers.

The working principle of MOS transistor

The structure of MOS transistor is similar to that of ordinary Field-effect transistor, which consists of source, drain and gate. The difference is that there is an extremely thin oxide insulation layer between the gate and source of MOS tube, called Gate oxide. When a positive voltage is applied to the gate, electrons will be attracted to form a conduction channel between the Gate oxide and the drain, so as to achieve conduction. When a negative voltage is applied to the gate, the conduction channel is closed and the MOS transistor is cut off.

Application of MOS transistors in controllers

MOS transistors are widely used in controllers, such as for voltage conversion, current control, switch control, etc. Among them, voltage conversion is one of the most common applications of MOS transistors. When the MOS transistor is on, its drain voltage is very low, which can convert high voltage into low voltage. Current control is another common application. The conduction resistance of MOS transistor is very low, which can achieve precise control of current. Switch control is also one of the common applications of MOS transistors. The high-speed switching characteristics of MOS transistors make them very suitable for use in switching circuits.

In summary, MOS transistors are widely used in controllers, with characteristics such as high-speed switching, low on-resistance, and low driving voltage. Understanding the working principle and application of MOS transistors can help us better design and apply controller circuits.