描述 Description

The NCP1244 is a new fixed-frequency current-mode controller featuring 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 dtector which detects the application unplug from the AC input line and triggers the X2 discharge current.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 achieveing 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 minimze the power consumption of the control circuitry.
This product is IEC60950 compliant. Please see the test report and certification in the Conformance report section below.

特性 Features

? Frequency Foldback and Skip Mode
? Maximizes efficiency in light load and standby conditions
? Timer-Based Overload Protection with Latched (Option A) or Auto-Recovery (Option B) operation
? Protection against overcurrent or short circuit conditions
? High voltage current source with Dynamic Self Supply (DSS)
? Provides fast, loss-less startup
? Internal Frequency Jittering
? Softer EMI signature
? Adjustable overpower protection
? Compensates peak current for changing line input voltage
? Dedicated latch off input
? Simplifies protection for fault conditions like overtemperature or overvoltage
? Integrated X2 capacitor discharge
? Eliminates the X2 capacitor discharge resistors and their associated parasitic consumption
? Power saving off mode when used with NCP4353 or NCP4354
? Allows the power supply to achieve extremely low no load power consumption

簡介

NCP1244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NCP1244AC 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(biāo)題。