onsemi Integrated Circuits (ICs) - Power Management (PMIC) - AC DC Converters, Offline Switches NCP12400BBHAA1DR2G

The NCP12400BBHAA1DR2G is a fixed-frequency current-mode controller designed for flyback converters, operating at either 65 kHz or 100 kHz. It features a dynamic self-supply function that simplifies the design of the auxiliary supply and VCC capacitor by providing internal startup current during various operational states. The device includes a high-voltage detector for brown-out detection and an X2 capacitor discharge function. This controller incorporates timer-based overload protection, which can operate in either latched or autorecovery modes, and adjustable compensation to maintain maximum power independent of input voltage. It also supports frequency foldback and skip mode for enhanced efficiency under light load conditions, achieving low standby power consumption of less than 30 mW. Additional features include internal thermal shutdown, a fault input for overvoltage and over-temperature protection, and a drive output capable of sourcing or sinking up to 500 mA. The NCP12400BBHAA1DR2G is suitable for applications such as offline adapters for notebooks, LCDs, printers, and auxiliary power supplies.