The NE2281 is a high-performance, highly integrated multi-mode PFC controller with high efficiency, low THD, and good EMI characteristics, which is mainly used in Boost PFC converters.
The NE2281 supports continuous on-mode (CCM), critical on-mode (CRM), and discontinuous on-mode (DCM) operation. CCM mode can effectively reduce the peak value of inductance current and improve the utilization rate of magnetic parts. The DCM mode switches different Drain voltage oscillation bottoms according to the actual current, optimizes the switching frequency when the current is low, and adaptively switches the three modes within one power frequency half-wave to optimize the converter efficiency.
The NE2281 integrates rich features to optimize the design for real-world applications. Active bridge driving function is beneficial to reduce AC input rectification loss; The X-Cap discharge function and built-in loop streamline the IC peripheral design. In addition, the NE2281 supports IC peripheral resistance Settings to enable/disable CCM and threshold adjustments to improve system efficiency.
NE2281 built-in CCM buffeting technology, so that the chip has good EMI performance. At the same time, the chip integrates a wealth of protection functions, including: cycle by cycle overcurrent protection (OCP), overpower limit (OLP), VCC undervoltage lock (UVLO), internal overtemperature protection (OTP), overvoltage protection (OVP), etc.