Dual output switching regulated power supply

The main output is +5V (3A) and the auxiliary output is +3.33V (0.1A) 15W switching regulated power supply. The circuit is as shown in the figure. The power supply uses a TO-220 packaged TOP223Y single-chip switching power supply with a maximum output power of 30W and can be used as a power supply for printers and monitors. If +3.3V is designed as the main power supply, it can be used as a switching power supply for notebook computers. The AC input voltage range of this power supply is 85~265V, the voltage regulation rate is ±0.7%, the load regulation rate is +1.1%, and the power efficiency eta>70%.