Find a circuit diagram of mos tube controlled by single chip microcomputer.

The circuit of driving mos tube by single chip microcomputer mainly depends on what MOS tube wants to drive. If it is only a small load such as relay, it can be driven directly with the pin of 5 1. Pay attention to the protection diode and absorption buffer of inductive load, and it is best to use N-channel MOS.

If the driving thing (power) is large, it is best to do electrical isolation, over-current and over-voltage protection, temperature protection and so on. At this time, it is necessary to isolate the transmission control signal (such as PWM signal) and transmit electric energy to the driving stage (driving circuit of MOS tube).

Commonly used signal transmission is PC923? PC929？ 6N 137？ TL52 1 etc. As for the transmission of electric energy, DC-DC module can be used. If you are a product, I suggest you make a suggested DC-DC, which can reduce the cost.

Extended data:

MOS tube application

1, low-voltage application

When using 5V power supply, if the traditional totem pole structure is used at this time, the actual final voltage applied to the gate is only 4.3V because the be of the transistor has a voltage drop of about 0.7V At this time, there are certain risks in choosing MOS transistors with a nominal gate voltage of 4.5V, and the same problems will occur when using 3V or other low-voltage power supplies.

2. Wide voltage application

The input voltage is not a fixed value, it will change with time or other factors. This change leads to the instability of the driving voltage provided by PWM circuit to MOS transistor.

In order to make MOS transistors safe under high gate voltage, many MOS transistors have built-in voltage regulators to forcibly limit the amplitude of gate voltage. In this case, when the supplied driving voltage exceeds the voltage of the regulator, it will lead to large static power consumption.