[原创] On Semi NCP1568有源箝位PWM控制器解决方案

On Semi公司的NCP1568是AC/DC转换器高度集成的有源箝位PWM控制器,采用有所有权的可变频率算法来实现超级结或GaN FET跨越线路和负载条件下的零电压开关(ZVS),从而增加功率密度,达到高效率.器件具有高压起动电路,强大的低边驱动器和用于有源箝位FET的5V逻辑电平驱动器,主要用在AC/DC适配器,工业,通信,照明和其它功率密度是主要考虑的应用.本文介绍了NCP1568主要特性,框图,应用电路和通用输入60W参考设计主要特性,电路图,材料清单和PCB设计图.

The NCP1568 is a highly integrated AC−DC PWM controllerdesigned to implement an active clamp flyback topology. NCP1568employs a proprietary variable frequency algorithm to enable zerovoltage switching (ZVS) of Super−Junction or GaN FETs across lineand load conditions. The ZVS feature increases power density of apower converter by increasing the operating frequency whileachieving high efficiency. The Active Clamp Flyback (ACF)operation simplifies EMI filter design to avoid interference with othersensitive circuits in the system. The NCP1568 features a HV startupcircuit, a strong low side driver, and a 5 V logic level driver for theactive clamp FET. The NCP1568 is suitable for a variety ofapplications including Ac−Dc adapters, industrial, telecom, lighting,and other applications where power density is an importantrequirement.
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