onsemi AC DC Converters, Offline Switches NCP1234AD100R2G

The NCP1234AD100R2G is a fixed-frequency current-mode controller designed for flyback converters, operating at a switching frequency of 100 kHz. It features Dynamic Self-Supply (DSS), which simplifies the design of the auxiliary supply and VCC capacitor by activating an internal startup current source during transients. The controller incorporates frequency foldback and skip mode to enhance efficiency under light load conditions while maintaining low standby power consumption. This device includes timer-based overload protection with options for latched or auto-recovery operation, adjustable compensation for maximum power independence from input voltage, and internal thermal shutdown for safety. It supports a VCC operation up to 28 V with overvoltage detection and offers a peak source/sink current drive capability of ±500 mA. The NCP1234AD100R2G is pin-to-pin compatible with previous NCP12xx series controllers, making it suitable for applications such as AC-DC adapters, offline battery chargers, and consumer electronic power supplies.