This is the "power" section of the 10203-1. The schematic includes:
A: Some variants are designed for power factor correction (PFC) circuits. In these, pin 1 connects to the bulk capacitor after a bridge rectifier (120V AC → 170V DC or 230V AC → 325V DC). Handle with extreme caution—these are live chassis designs. 10203-1 schematic
A typical schematic for the 10203-1 (Version A) reveals four major functional blocks. You can expect to find these elements when you open the datasheet or reverse-engineer the PCB. This is the "power" section of the 10203-1