On Semi NCP4303高效开关电源解决方案

On Semi 公司的NCP4303是次级同步整流驱动器，是高效开关电源（SMPS）解决方案。NCP4303具有阈值可调的精密的次级零电流检测，工作模式包括CCM，DCM和QR反激拓扑。工作电压高达30V，具有5A/2.5A峰值沉/源驱动能力，典型应用包括笔记本电脑适配器，大功率密度的AC/DC电源，游戏机和所有高效开关电源。本文介绍了NCP4303主要特性，方框图，ZCD检测电路框图以及LLC转换器，DCM或QR反激转换器与在宽频LLC应用的电路。

Secondary Side Synchronous Rectification Driver for High Efficiency SMPS Topologies

The NCP4303A/B is a full featured controller and driver tailored to control synchronous rectification circuitry in switch mode power supplies. Thanks to its versatility, it can be used in various topologies such as flyback, forward and Half Bridge Resonant LLC.

The combination of externally adjustable minimum on and off times helps to fight the ringing induced by the PCB layout and other parasitic elements. Therefore, a reliable and noise less operation of the SR system is insured.

The extremely low turn off delay time, high sink current capability of the driver and automatic package parasitic inductance compensation system allow to maximize synchronous rectification MOSFET conduction time that enables further increase of SMPS efficiency.
..

查看全文