onsemi PFC (Power Factor Correction) NCP1654BD133R2G

The NCP1654BD133R2G is a Power Factor Correction (PFC) controller designed for Continuous Conduction Mode (CCM) step-up pre-converters. It operates in a fixed frequency mode and adjusts the power switch conduction time based on the instantaneous coil current. This device is housed in a compact SO8 package, which minimizes the number of external components required for implementation, thereby simplifying the design process. Key features include compliance with IEC61000,àí3,àí2 standards, a fast transient response, very low startup currents (less than 75 µA), and low shutdown currents (less than 400 µA). The controller integrates several safety features such as overvoltage protection, undervoltage detection, brown-out detection, and accurate overcurrent limitation. It also includes a soft-start function for smooth startup operation and a latching PWM for cycle-by-cycle duty-cycle control. The NCP1654BD133R2G is suitable for applications in flat TVs, PC desktops, AC adapters, and other offline switch-mode power supplies (SMPS). Its operating junction temperature range is from -40°C to +125°C, making it versatile for various environmental conditions. The device is also Pb-free, aligning with modern environmental standards.