220V AC Cooling Fan power module circuit design

In the "220V AC Cooling Fan" system SPCE061A the need to use 3.3V power supply, AMS1117 chip production. AMS1117 is a positive LDO, AMS1117, there are two: one for fixed output voltage, ios版雷竞技官网入口 " output voltage values are: 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V; another is to regulate the output voltage. AMS1117 internal integrated thermal protection circuit and over current protection circuit. In order to protect the "ios版雷竞技官网入口 " of stability at the output to be connected to at least 22UF a tantalum capacitor voltage generated by the AMS1117 3.3V constituted