NCP1379数据手册集成电路（IC）的ACDC转换器离线开关规格书PDF

描述 Description

The NCP1379 is a high performance device aimed at 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 triggering 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. To improve the safety in the overload situations, the controller includes an Over Power Protection (OPP) circuit which clamps the delivered power at high-line. Safety-wise, a fixed internal timer relies on the feedback voltage to detect a fault. Once the timer elapses, the controller stops and enters auto-recovery mode, ensuring a low duty-cycle burst operation. Particularly well suited for TV power supply applications, the controller features a low startup voltage allowing use of an auxiliary supply to power the device.

特性 Features

• Quasi-resonant peak current mode control operation
• High efficiency operation
• Valley switching operation with valley lockout
• Provides for noise-immune operation
• Frequency foldback at light load
• Improves light load efficiency
• Adjustable overpower protection
• Auto-recovery output short circuit protection
• Fixed internal 80 ms timer for short circuit protection
• VCC range operation up to 28 V

应用 Application

• Auxiliary power supplies (flat TV, appliances)
• Power AC-DC converters for adapters, TVs and set top boxes

简介

NCP1379属于集成电路（IC）的ACDC转换器离线开关。由制造生产的NCP1379AC DC 转换器，离线开关该系列是元器件级控制产品，用于构建将交流市电转换为直流电（通常电压大幅降低）的设备。集成和未集成系统主要开关元件的器件均包括在内。由于高输入输出电压比，以及此类系统中通常需要隔离，这些器件通常与外部变压器配合使用。尽管通常使用定制变压器来实现此用途，但也有许多专门用于此用途的库存产品，请参见“开关转换器，SMPS 变压器”标题。