NCP1336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 NCP1336 hosts a high-performance circuitry aimed to powering quasi-resonant converters. Capitalizing on anovel 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. The controller takes benefit of a high-voltage start-up current source to provide a quick and lossless power-on sequence. To improve the safety in overload situations, the controller includes an Over Power Protection circuit which clamps the delivered power at high-line. Safety-wise, an adjustable timer relies on the feedback voltage to detect a fault. On version B, this fault triggers a triple-hiccup on the VCC pin which naturally reduces the average input power drawn by the converter. On version A, when a fault is detected, the controller is latched-off.Particularly well suited for adapter applications, the controller features two latch inputs: one dedicated to Over Temperature protection (OTP) which offers an easy means to connect a pull-down temperature sensor like an NTC, and a second one more classical that can be used ot performa an accurate Over voltage Protection. Finally, a brownout pin whcih stops the circuit operation in presence of a low mains condition is included.

特性 Features

• Valley Switching Operation with Valley-Lockout
• Improved efficiency with noise immunity
• Loss-free Adjustable Over Power Protection
• Limits the peak current according to input line voltage
• Auto-recovery or Latched Short-Circuit Protection with adjustable timer
• Versatile short circuit protection for improved reliability
• Dedicated Overtemperature Protection Input
• Allows direct connection to NTC for accurate OTP
• Brown Out Protection
• Protects against drops in input mains voltage
• High voltage startup current source
• Provides a quick and lossless power-on sequence

应用 Application

• High Power Ac-Dc converters
• Notebook Adapters
• Flat TV SMPS

简介

NCP1336属于集成电路（IC）的ACDC转换器离线开关。由制造生产的NCP1336AC 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。