描述 Description

The NCP1366 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 NCP1366 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

? 560-V Startup Current Source
? Saves external HV FET or inefficient resistor divider
? 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
? Build-in soft-sart
? Low Start-up current ( 2 μA typ.)
? Less than 10 mW No-Load Performance at High Line with NCP1366 version
? Less than 30 mW No-Load Performance at High Line with NCP1361 version
? These are Pb-Free Devices

應用 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

簡介

NCP1366屬于集成電路（IC）的ACDC轉換器離線開關。由制造生產(chǎn)的NCP1366AC DC 轉換器，離線開關該系列是元器件級控制產(chǎn)品，用于構建將交流市電轉換為直流電（通常電壓大幅降低）的設備。集成和未集成系統(tǒng)主要開關元件的器件均包括在內(nèi)。由于高輸入輸出電壓比，以及此類系統(tǒng)中通常需要隔離，這些器件通常與外部變壓器配合使用。盡管通常使用定制變壓器來實現(xiàn)此用途，但也有許多專門用于此用途的庫存產(chǎn)品，請參見“開關轉換器，SMPS 變壓器”標題。