描述 Description

The NCP1341 is a highly integrated quasi?resonant flyback controller suitable for designing high?performance off?line power converters. With an integrated active X2 capacitor discharge feature, the NCP1341 can enable no?load power consumption below 30 mW.
The quasi?resonant current?mode flyback stage features a proprietary valley?lockout circuitry, ensuring stable valley switching. This system works down to the 6th valley and transitions to a frequency foldback mode to reduce switching losses. As the load decreases further, the NCP1341 enters quiet?skip mode to manage the power delivery.
The NCP1341 integrates power excursion mode (PEM) to minimize transformer size in designs requiring high transient load capability. If transient load capability is not desired, the NCP1340 offers the same performance and features without PEM.
To help ensure converter ruggedness, the NCP1341 implements several key protective features such as internal brownout detection, a non?dissipative Over Power Protection (OPP) for constant maximum output power regardless of input voltage, a latched over voltage and NTC?ready over-temperature protection through a dedicated pin, and line removal detection to safely discharge the X2 capacitors when the line is removed.

特性 Features

? QR Frequency Jittering
? Reduces EMI Signature
? New Quiet-Skip Technology
? Ensures Operation Outside Audible Range
? Integrated HV Startup with Brownout Protection
? Provides an efficient power-on source and protects agaisnts drops in input mains voltage
? Valley Switching Operation with Valley Lockout
? Maximizing the efficiency over the entire power range
? Integrated X2 Capacitor Discharge Capability
? Eliminates the need for a X2 resistors
? NTC Compatible Fault Pin
? Extra protection against high temperature or other fault conditions
? High Drive Capability: -500 mA / +800 mA
? Enables faster switching of primary-side MOSFET
? Latch input for OVP and OTP implementations
? Simple implementation of required protection functions
? Power Excursion Mode (PEM)
? Minimize transformer size in designs requiring high transient load capability

應(yīng)用 Application

? Medium or High Power AC-DC Adapters
? Ultra High Density AC-DC Adapters
? Computer Power Supplies
? Phone and Tablet Adapters
? Notebook Adpaters
? Flat TV SMPS
? Computer Power Supplies
? Phone and Tablet Adapters

簡(jiǎn)介

NCP1341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NCP1341AC DC 轉(zhuǎn)換器，離線開關(guān)該系列是元器件級(jí)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(shí)現(xiàn)此用途，但也有許多專門用于此用途的庫(kù)存產(chǎn)品，請(qǐng)參見“開關(guān)轉(zhuǎn)換器，SMPS 變壓器”標(biāo)題。