描述 Description

The NCP1252 controller offers everything needed to build cost effective and reliable ac-dc switching supplies dedicated to ATX power supplies or any forward application. Thanks to the use of an internally fixed timer, NCP1252 detects an output overload without relying on the auxiliary Vcc. A Brown-Out input offers protection against low input voltages and improves the converter safety. Finally, the SOIC-8 package saves PCB space and represents a solution of choice in cost sensitive project.

特性 Features

? Peak current mode control
? Help to build rugged power supplies
? Adjustable switching frequency
? High flexibility on the switching frequency
? Latched primary overcurrent protection with 10 ms fixed delay
? Allow temporary over load/current and latch permanent fault
? Adjustable soft start timer
? Flexibility on the soft start duration
? Auto recovery brown out detection
? Resume the power supply operation after a brown out detection
? Internal 160 ns leading edge blanking
? Noise immunity improved
? Frequency jittering
? Improve the EMI signature by spreading the noise
? Adjustable internal ramp compensation
? Save external components
? +500 mA / -800 mA Source/Sink current driver capability
? No need of external power MOSFET driver
? Skip cycle operation in light/no load operation
? Save dummy load
? SOIC-8 package
? Save PCB area
? Extended Vcc range up to 28 V with auto recovery UVLO

應用 Application

? Power supplies for PC silver boxes
? Ac-dc adapter converter
? Game Adapter
? Flyback and Forward Application
? Desktops

簡介

NCP1252屬于集成電路（IC）的ACDC轉(zhuǎn)換器離線開關。由制造生產(chǎn)的NCP1252AC DC 轉(zhuǎn)換器，離線開關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(zhuǎn)換器，SMPS 變壓器”標題。