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

應(yīng)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

簡介

NCP12400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NCP12400AC 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”標題。