There is information in Chinese.
CSC7203 is a Chinese language course, most of which involves Chinese material.
You can search relevant Chinese literature in major academic search engines, or you can ask teachers or postgraduate seniors for help to obtain Chinese materials.
CSC7203 High-performance current mode PWM switching power supply circuit
High Performance Current Mode PWM Switch 85V ~ 265V 12W No auxiliary winding, current detection resistor built-in 700V power triode DIP8