NCP1365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 NCP1365 offer 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 eliminates the need for a secondary feedback circuitry (typically an opto-coupler and TL431 reference) while achieving excellent line and load regulation.
The NCP1365 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
• Prevents high frequency interference with a touchscreen
• Quasi-Resonant with Valley Switching Operation
• Offers high efficiency operation
• 560-V Startup Current Source
• Saves external HV FET or inefficient resistor divider
• Fixed Peak Current & Deep frequency foldback @ light load operation
• Low consumption at light load
• Cycle by Cycle peak current limit
• Safe operation
• Wide Operation VCC range (up to 28 V)
• Design flexibility
• Internal Temperature Shutdown
• Safe operation
• CS & Vs/ZCD pin Short and Open Protection
• Safe operation
• Constant Current Primary-side feedback eliminates secondary controller
• ±10% Current Regulation
• Build-in soft-sart
• Low Start-up current (2.5 μA typ.)
• Clamped Gate-drive Output for Mosfet
• Less than 10 mW No-Load Performance

应用 Application

• AC-DC USB chargers for cell phones, tablets, and other portable devices
• AC-DC USB chargers for cell phones, tablets, and other portable devices

简介

NCP1365属于集成电路（IC）的ACDC转换器离线开关。由制造生产的NCP1365AC 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。