: The rectified voltage is smoothed out by a high-voltage electrolytic filter capacitor (typically rated around 4.7µF, 400V or 450V). On the bottom of the PCB, this high-voltage node is often marked near the capacitor traces as DC310V , which is the expected DC peak voltage from a standard 220V AC utility grid. 2. The Primary-Side Regulation (PSR) Controller
Proper ventilation is required, as the switching IC can get quite warm at maximum load (700mA). 4. Common Applications wx-dc12003 schematic