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May I ask how the MOS tube or optocoupler realizes the switch drive problem.

Hardware design
February 23, 2021 by Erica 53

When doing a circuit design, using a 9~24V power supply to power a device, it is necessary to realize the function of powering off the device three minutes after manual startup. Use an STM32 IO port as a switch. How to realize this switch drive using mos tube or optocoupler? The current of the device is 400mA at 12V. Ask everyone. Thank you

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Frank Posted on February 23, 2021

It is recommended to use P MOS transistors. Generally speaking, optocouplers are mostly used for signal devices to isolate interference and the like, so it is better to use P-type MOS transistors for switch drive. N-type MOS transistors are used in an environment with a voltage of about 5V, generally more than 12V. It is recommended to use P-type MOS transistors. Of course, this is mainly a cost issue. If you are not short of money, you can choose whatever you want. If you use a P-type MOS tube, connect the MOS tube to the positive pole of the power supply and equipment, and then use a small The triode drives the MOS tube, and the link method is from the chip IO port to the triode to the MOS tube to the device.

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Lacey Posted on February 23, 2021

Use a MOS tube to form a common source circuit, the IO port of the microcontroller controls the gate of the MOS tube, and then pay attention to the withstand voltage and Id of the MOS tube.

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Xander Posted on February 23, 2021

A triode should be used to drive the MOS tube. The supply voltage of the microcontroller is generally less than the driving voltage of the MOS tube.

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