On Semi NCP1380准谐振电流模式大功率离线电源方案

On Semi 公司的NCP1380是大功率通用离线电源用的准谐振电流模式控制器,谷底开关工作,轻负载时频率回馈以提高效率, 峰值电流源/沉为+500mA/-800mA, 无负载的待机功耗极低,适用于TV,STB的大功率AC/DC转换器,笔记本电脑的离线适配器.本文介绍NCP1380主要特性,内部电路架构, 谷底检测电路, 过载检测电路, 过压/超温检测电路以及典型应用电路.

Quasi-Resonant Current-Mode Controller for High-Power Universal Off-Line Supplies

The NCP1380 hosts a high−performance circuitry aimed to powering quasi−resonant converters. Capitalizing on a proprietary valley−lockout system, the controller shifts gears and reduces the switching frequency as the power loading becomes lighter. This results in a stable operation despite switching events always occurring in the drain−source valley. This system works down to the 4th valley and toggles to a variable frequency mode beyond, ensuring an excellent standby power performance.
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