描述 Description

The NCP1126 products integrates a fixed?frequency peak current mode controller with a low on? resistance high voltage, 650 V MOSFET. Available in a PDIP?7 package, the NCP1126 offers a high level of integration, including soft?start, frequency?jittering, short?circuit protection, thermal shutdown protection, frequency foldback mode and skip?cycle to reduce power consumption in light load condition, peak current mode control with adjustable internal ramp compensation and adjustable peak current set point.During nominal load operation, the part switches at one of the available frequencies (65 or 100 kHz). When the output power demand diminishes, the IC automatically enters frequency foldback mode and provides excellent efficiency at light loads. When the power demand reduces further, it enters into a skip mode to reduce the standby consumption down to no load condition.Protection feature include: a timer to detect an overload or a short?circuit event with auto?recovery or latch protection, and a built?in VCC overvoltage protection.
The switcher also provides a jittered 65 kHz or 100 kHz switching frequency to improve the EMI.

特性 Features

? 650 V Avalanche Rated MOSFET
? Rugged MOSFET for robust design
? FixedFrequency 65 or 100 kHz CurrentMode Control Operation
? Ability to scale for efficiency or size
? Frequency Foldback Down to 26 kHz and SkipCycle in Light Load Conditions
? Eliminate acoustic noise and improved efficiency at light loads
? Adjustable Current Limit with External Resistor
? Scale for various designs 5W~20W
? 50 ms Timer-Based Auto-Recovery Short-Circuit Protection
? Provides more robust protection without worrying about the coupling of the aux winding
? Frequency Jittering in Normal and Frequency Foldback Modes
? Improved efficiency at light load / Improved EMI over the entire load
? Option for Auto-Recovery or Latched Short-Circuit Protection
? Flexible protection options
? Less than 100 mW Standby Power at High Line
? EPS 2.0 Compliant

應(yīng)用 Application

? Power Supply
? Power supply for DVD, STB, CD-Player
? Aux supply for TV, USB, Appliance

簡介

NCP1126屬于集成電路（IC）的ACDC轉(zhuǎn)換器離線開關(guān)。由制造生產(chǎn)的NCP1126AC DC 轉(zhuǎn)換器，離線開關(guān)該系列是元器件級控制產(chǎn)品，用于構(gòu)建將交流市電轉(zhuǎn)換為直流電（通常電壓大幅降低）的設(shè)備。集成和未集成系統(tǒng)主要開關(guān)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(shí)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(guān)轉(zhuǎn)換器，SMPS 變壓器”標(biāo)題。