PWM controller IC. This chip regulates the output by controlling the switching frequency and pulse width. Output Stage
If you have an S36012 module and want to verify your version’s schematic: s36012 power supply circuit diagram
The is one of the most ubiquitous industrial switching power supplies on the market. Rated for 12V DC at 30A (360 Watts) , it is the "workhorse" for 3D printers (like the Creality Ender series), CCTV systems, and amateur radio setups. PWM controller IC