In the field of telecommunications industry and microwave circuit design, MOS tubes are generally used to control the inrush current to achieve the purpose of current slow start. The MOS tube has the characteristics of low on-resistance Rds_on and simple driving, and a slow-start circuit can be formed by adding a small number of components around it. Although the circuit is relatively simple, a deep understanding of this circuit can only be obtained after the relevant switching characteristics of the MOS tube are thoroughly understood.
Although MOSFETs are widely used in some electronic systems such as switching power supplies and motor control, many electronic engineers do not have a very clear understanding of the MOSFET switching process and the state of the MOSFET during the switching process. Generally speaking, electronic engineers usually base on Gate charge understands the process of turning on a MOSFET.