NCP1252中文资料PWM控制器，电流模式，用于正向和反激应用数据手册ONSEMI规格书

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

应用 Application

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

简介

NCP1252属于集成电路（IC）的ACDC转换器离线开关。由制造生产的NCP1252AC 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。