MOSFET Operating Characteristics

Post Time: Jul-09-2024

In fact, from the name, the power MOSFET is that it can work again when the output current is larger, MOSFET classification is divided into many kinds, which around the characteristics of the power consumption we can be divided into enhancement and depletion of type, if in accordance with the channel to choose the words can be divided into N-channel type and P-channel type.
MOSFETs are mainly used as a system switch in systems that output power. If we add another voltage between the gate and the source of an N-channel MOSFET, it will turn on its power switch. Once the power switch is on, current flows through the power switch from the drain to the source. There is an internal resistance between the drain and the source, which we generally call the on-resistor RDS(ON). It must be clear that the gate of the MOSFET is actually a high characteristic impedance terminal, so we need to add another voltage to the gate. When the voltage between the source and the gate is zero, the power switch turns off and the current flow terminates according to the device. Even though the device has been switched off for a long time, there is still a small amount of current present, which is called the leakage current IDSS.
Because MOSFETs are one of the most essential components of an electrical control system, selecting the right MOSFET plays an important role in the success of the entire design programme. Only by mastering the types of MOSFETs and their key characteristics, designers can select the right MOSFET for a particular design.

Power MOSFET is a more commonly used class of power devices, the full name of the Chinese is - metal oxide semiconductor field effect tube. It belongs to a power output device, mainly composed of metal, oxide and semiconductor materials. So what is the power MOSFET?

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