The NCP1239DD65R2G is a high-performance, fixed-frequency, current-mode controller designed by ON Semiconductor for high-efficiency, off-line power supplies. This advanced component integrates numerous features to streamline the design process and enhance operation in applications such as AC-DC adapters, open-frame SMPS, and LCD TVs.

Key Features

• Current-Mode Operation: The device's current-mode control provides an inherent line voltage feed-forward feature, ensuring stable and low cross-regulation performance over a wide input voltage range.
• Frequency Foldback: To improve efficiency under light-load conditions, the NCP1239DD65R2G automatically reduces switching frequency, minimizing standby power consumption.
• Dynamic Self-Supply: Eliminating the need for an auxiliary winding, this feature allows the controller to extract power directly from the high-voltage line, simplifying the power supply design.
• Adjustable Overcurrent Protection: The device offers a user-configurable overcurrent protection threshold to safeguard the system against short circuits and overloads.
• Brown-Out Protection: The built-in brown-out protection ensures stable operation during abnormal input voltage conditions, protecting the power supply and the load.
• Auto-Recovery Overvoltage Protection: The NCP1239DD65R2G features an internal overvoltage protection circuit that automatically recovers, helping to prevent damage to the power supply and the end application.

Applications

The versatility of the NCP1239DD65R2G makes it suitable for a wide range of off-line power supply applications. Its robust protection features and high efficiency make it an ideal choice for:

• AC-DC Adapters for Laptops and Mobile Devices
• Open-Frame Switched-Mode Power Supplies (SMPS)
• Power Supplies for LCD TVs and Monitors
• Standby and Auxiliary Power Supplies

Environmental and Quality Certifications

ON Semiconductor is committed to environmental stewardship and product quality. The NCP1239DD65R2G complies with various industry standards, ensuring reliability and performance across different conditions and applications.