How does 4569a power chip work?

The working principle of the switching power supply chip is:

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1. The AC power input is rectified and filtered into DC;

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2. The switch tube is controlled by the high-frequency PWM(pulse width modulation) signal, and the DC is added to the switching transformer primary;

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3. Switching transformer secondary induction of high-frequency voltage, through the rectification filter to supply load;

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4. The output part is fed back to the control circuit through a certain circuit to control the PWM duty cycle to achieve the purpose of stable output.