The NCP1239LD65R2G from ON Semiconductor is a high-performance, fixed-frequency, current-mode controller designed for high-efficiency, AC-DC power supplies. This device integrates numerous features that contribute to robust and efficient power supply designs, particularly for adapters, open-frame power supplies, and LCD TV applications.

Key Features

• Fixed-Frequency Operation: The NCP1239LD65R2G operates at a fixed frequency, which simplifies the EMI filter design and helps in achieving consistent performance.
• Current-Mode Control: This control method provides excellent line regulation, fast transient response, and eases loop stabilization.
• High-Voltage Startup: The integrated high-voltage startup circuitry enables the device to start up directly from the rectified mains voltage, reducing the number of external components required.
• Frequency Foldback: To improve efficiency at light loads, the NCP1239LD65R2G features frequency foldback, which reduces switching losses by lowering the switching frequency.
• Auto-Recovery Overcurrent Protection: The device offers overcurrent protection (OCP) with auto-recovery, which helps protect the power supply and its load from damage due to overcurrent conditions.
• Brown-Out Protection: The brown-out protection ensures stable operation during periods of low input voltage, preventing damage to the power supply and the end application.
• Adjustable Overvoltage Protection: The overvoltage protection can be adjusted to meet the specific requirements of the application, providing an additional layer of safety.
• Soft-Start: The soft-start feature minimizes stress on the power supply during startup by gradually increasing the output voltage.

Applications

With its robust feature set, the NCP1239LD65R2G is well-suited for a wide range of applications, including:

• AC-DC Adapters for Laptops and Mobile Devices
• Open-Frame Switching Power Supplies
• Power Supplies for LCD TVs and Monitors
• Offline Power Converters

Quality and Reliability

ON Semiconductor is known for its commitment to quality and reliability. The NCP1239LD65R2G is built to meet the high standards of performance and durability that the industry expects from ON Semiconductor products.