The NCP1234AD100R2G is an integrated circuit (IC) component developed by ON Semiconductor. It belongs to the NCP123x series, which consists of high-performance current-mode controllers for switched-mode power supplies (SMPS). The NCP1234AD100R2G specifically is a controller designed for PWM (Pulse Width Modulation) flyback converters.
Key Features:
1. High Voltage Start-up: The NCP1234AD100R2G is capable of directly operating from the rectified universal mains, providing a high voltage start-up capability.
2. Quasi-Resonant Mode: This IC utilizes a quasi-resonant mode operation, ensuring high efficiency and reducing EMI (Electromagnetic Interference). By operating the power switch with zero-voltage switching (ZVS), it minimizes switching losses.
3. Dynamic Self-Supply: The device features a dynamic self-supply (DSS) function, eliminating the need for an auxiliary bias winding in the transformer. This reduces the overall system cost and complexity.
4. Accurate Power Limit: The IC incorporates an advanced technique to regulate the power delivered to the load accurately. It enables precise control to avoid overloading or underloading conditions.
5. Frequency Foldback: In case of overvoltage conditions, the NCP1234AD100R2G implements a frequency foldback mechanism. It reduces the switching frequency rapidly, thus preventing damage to the converter
