220V AC Cooling Fan power module circuit design and analysis

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, the voltage value "ios版雷竞技官网入口 " has the power module output: 1.5V, 1.8V, 2.5V, 2.85V, 3.0 V, 3.3V; the other is to regulate the output voltage. AMS1117 internal integrated thermal protection circuit and overcurrent protection circuit. In order to protect the stability of the AMS1117, the "ios版雷竞技官网入口 " power module to be connected to an output of at least 22UF tantalum capacitor voltage generated by the AMS1117 3.3V constituted