If you do not know the model of the switching power supply chip, you can try to determine it in the following ways:
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1. Check whether the chip model or brand is marked on the device schematic diagram or circuit board.
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2. Use a multimeter to test the voltage and current of the chip pins to determine the chip type.
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3. According to the working principle of the switching power supply and demand parameters (output voltage, current, etc.) to screen possible chip models, and check through the reference manual or data manual.
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4. If the above methods can not determine the chip model, you can consult the manufacturer or professional electronic maintenance personnel.
The switching power chip does not know the model, you can go to the circuit diagram, there is a model on the diagram