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Classic application of MOS transistor circuit design (2) - switch circuit design
2022-07-05 08:06:00 【Learning notes of hardware Xiaobai】
Previous section , We talked about it. MOS The application of tube in bidirectional level conversion . This application can be said to be very classic . Today I'm going to talk about MOS The tube is used as a switch .
Hardware everyone knows MOS Tubes belong to voltage control components . That is to say MOS When the grid of the tube is applied with voltage , When the grid - The voltage difference of the source voltage is greater than Vgs(th) when ,MOS The tube can be connected ( Not too big , Otherwise it will burn down ). When the source voltage is determined , We can control the grid voltage to achieve MOS The conduction and cut-off of the tube , And that's how it works MOS On and off of the tube drain or grid load .
- NMOS tube
Source grounding , The grid source voltage is equal to the grid voltage , At this time, we add PWM, That is to say MOS The conduction and cut-off of the tube , Conduction time , The LED works normally . At the deadline , Led stops working .
The LED is not connected to the grid , reason , It is not convenient to judge the gate source voltage at this time . Usually in NMOS Make a switch , The load is connected to the drain .
- PMOS tube
Source voltage , Grid connected PWM. The gate source voltage is greater than Vgs(th) when ,MOS The pipe is open . Led works . When the gate source voltage is less than Vgs(th) when ,MOS Pipe cut off , Led stops working .
The LED is not connected to the source , Because the source voltage cannot be judged . It is not directly connected to the drain electrode for convenience .
In short, when making switches , The load is connected to the drain .
In some scenarios , The circuit will also be designed for soft start . As follows :
resistance R And C Constitute the function of soft start .
Soft start makes MOS The power on of the tube grid is more gentle , At the same time, time increases .
The following is a comparison of whether delay is used in other projects .
Soft start
Non soft start
It can be seen that the effect of soft start is better than that without soft start measures , So the design of soft start , stay MOS It is also particularly important when making switches .
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