: A high-frequency transformer provides the 3kV galvanic isolation between the primary (hot) and secondary (safe) sides.
: The AC input typically passes through a small EMI filter and a bridge rectifier. A high-voltage electrolytic capacitor (often 4.7µF, 400V) smooths the rectified DC.
: A PC817 optocoupler is used in conjunction with a precision resistor divider to provide feedback to the primary-side controller, ensuring the 5V output remains steady under varying loads. Practical Applications
: Approximately 80% with a no-load power consumption of less than 0.05W.
While a single "official" datasheet is rare for these modules, reverse-engineered schematics reveal a standard .
Because of its tiny footprint (approximately 23.5 x 18.1 mm), the WX-DC12003 is a favorite for:
: Powering sensors and wireless modules directly from wall power.
