The pin function of the switching power supply chip varies according to different chip models and manufacturers, but usually includes the following aspects:
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1. Input voltage pin: usually called VIN or VCC, used to access the power supply voltage.
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2. Push tube pin: usually called SW or SWITCH, used to control the switch of the switch tube to achieve the switch control of the power supply.
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3. Output voltage pin: usually called VOUT or VCC, used to output the voltage of the power supply.
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4. Feedback pin: Usually called FB, used to provide feedback signals to the chip to control the stability of the output voltage.
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5. Adjust pin: usually called ADJ or CTRL, used to adjust the size of the output voltage.
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6. Ground pin: usually called GND, the ground wire used to connect to the power supply.
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It should be noted that different switching power supply chips may have different pin functions and naming methods, which need to be confirmed according to the data manual of the chip. At the same time, when using the switching power supply chip, it is necessary to connect in strict accordance with the circuit design diagram, and pay attention to the correct wiring of the pins to ensure the normal operation and stability of the power supply.