Pin 1 is the power pin of the VDD chip.
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Pin 2,3 is the feedback pin of the FB system, which regulates the output voltage in CV mode and the output current in CC mode according to the flyback voltage of the auxiliary winding.
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Pin 4 is the CS current detection input pin.
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Pin 5 and pin 6 are drain power MOSFET drains.
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Pin 7 is the grounding of the GND IC.