NCP12400中文资料用于反激转换器的固定频率电流模式控制器（集成高电压启动和X2放电电路）数据手册ONSEMI规格书

描述 Description

The NCP12400 is a new fixed−frequency current−mode controller featuring the Dynamic Self−Supply. This function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal startup current source to supply the controller during start−up, transients, latch, stand−by etc. This device contains a special HV detector which detects the application unplug from the ac input line and triggers the X2 discharge current. This HV structure allows the brown−out detection as well. It features a timer−based fault detection that ensures the detection of overload and an adjustable compensation to help keep the maximum power independent of the input voltage. Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for the robust power supply designs. A dedicated Off Mode allows to reach the extremely low no load input power consumption via “sleeping” whole device and thus minimize the power consumption of the control circuitry. In addition, the NCP12400 features a quiet skip mode which lockes the skip frequency below audiable range. This feature greatly reduces audiable noise caused by the switching pulses during skip mode.

特性 Features

• Integrated HV Start-up and X2 Discharge
• Reduces Overall System Cost and Complexity
• Quiet Skip Feature
• Ensures Skip Mode Operation Outside Audible Range
• Frequency Foldback and Skip Mode
• Average Efficiency Meets CoC Tier 2 Compliance
• Timer−Based Overload Protection with Latched Or Auto-recovery
• Configurable Protection Tailored for Application Needs.
• Fault Input for Overvoltage and Over Temperature Protection
• Meets Safety Requirements
• Adjustable Overpower Protection Dependant on the Mains Voltage
• Meets Safety Requirements
• No Load Standby Power
• Meets CoC Tier 2 Compliance
• Frequency Modulation for Softened EMI Signature
• Meets EMI Compliance

应用 Application

• Auxiliary Power Supply for Computing Device
• General 20 W to 65 W AC-DC Adapter
• Offline Adapters for Notebooks, LCD, and Printers
• Offline Battery Chargers
• Consumer Electronic Power Supplies

简介

NCP12400属于集成电路（IC）的ACDC转换器离线开关。由制造生产的NCP12400AC 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。