NCP1361中文资料低功耗离线恒定电流 PWM 电流模式控制器数据手册ONSEMI规格书

描述 Description

The NCP1361 offers a new solution targeting output power levels from a few watts up to 20 W in a universal-mains flyback application. Thanks to a novel method this new controller saves the secondary feedback circuitry for constant current regulation while achieving excellent line and load regulation with traditional opto coupler and TL431 voltage reference. The NCP1361 operates in valley lockout quasi-resonant peak current mode control mode at high load to provide high efficiency. When the power on the secondary side starts to diminish, the controller automatically adjusts the duty-cycle then at lower load the controller enters in pulse frequency modulation at fixed peak current with a valley switching detection. This technique allows keeping the output regulation with tiny dummy load. Valley lockout at the first 4 valleys prevent valley jumping operation and then a valley switching at lower load provides high efficiency.

特性 Features

• No frequency clamp, 80 or 110 kHz Maximum Switching Frequency
• Prevent high frequency interference with a touchscreen
• Quasi-Resonant with Valley Switching Operation
• QR architecture offers high efficiency operation
• Fixed Peak Current & Deep frequency foldback @ light load operation
• Low light load consumption
• Wide Operation VCC range (up to 28 V)
• Design flexibility
• Cycle by Cycle peak current limit
• Safe operation
• CS & Vs/ZCD pin Short and Open Protection
• Safe operation
• Internal Temperature Shutdown
• Safe operation
• Constant Current Primary-side feedback eliminates secondary controller
• ±10% Current Regulation
• Clamped Gate-drive Output for Mosfet
• Built-in soft-start
• Low Start-up current ( 2 μA typ.)
• Less than 30 mW No-Load Performance at High Line
• These are Pb-Free Devices

应用 Application

• AC-DC USB Charging
• Cell Phones
• Tablets
• Portable Devices

简介

NCP1361属于集成电路（IC）的ACDC转换器离线开关。由制造生产的NCP1361AC 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。