PSR ACDC- CN1812

The CN1812 is a primary-side feedback control chip that meets six levels of energy efficiency and integrates a 650V/2A high-voltage power MOS internally with a maximum power of 12 W. With primary-side voltage and current sampling technology, the CN1812 eliminates the need for optocouplers and secondary-side control circuits, simplifying the design of CV/CC-mode switching power supplies and featuring precise output voltage and current regulation. The CN1812's multiple modes of operation achieve a standby power consumption of 75mW, high efficiency and no noise. Frequency dithering technology can greatly reduce the cost of EMI filters. Built-in line voltage compensation in constant voltage mode and externally adjustable line loss compensation. Precision adjustable CV/CC in SOP-7 package features low cost and high reliability. The chip integrates a variety of protection functions including: cycle-by-cycle peak current limit, VCC undervoltage lockout (UVLO), overvoltage protection (OVP) and clamping, VS overvoltage protection, VS undervoltage protection, over-temperature protection, and when an abnormality occurs, the controller continually attempts a soft restart until the fault condition is removed.