onsemi AC DC Converters, Offline Switches NCP1246ALD100R2G

The NCP1246ALD100R2G is a fixed-frequency current-mode controller designed for flyback converters, operating at a frequency of 100 kHz. It features a dynamic self-supply function that simplifies the design of the auxiliary supply and VCC capacitor by activating an internal startup current source during various operational states. The device includes a high-voltage detector for brown-out detection and an X2 capacitor discharge function. This controller offers timer-based overload protection with options for latched or auto-recovery operation. It incorporates frequency foldback and skip mode to enhance efficiency under light load conditions, achieving low standby power consumption of less than 30 mW. The NCP1246ALD100R2G supports a VCC operation up to 28 V and includes features such as internal thermal shutdown, adjustable overpower protection, and frequency modulation to reduce EMI. Typical applications include AC-DC adapters for notebooks, offline battery chargers, and consumer electronic power supplies. The product is packaged in a 7-lead SOIC format and is compliant with RoHS standards.