NCP1381集成電路（IC）的ACDC轉(zhuǎn)換器離線開(kāi)關(guān)規(guī)格書(shū)PDF中文資料

NCP1381屬于集成電路（IC）的ACDC轉(zhuǎn)換器離線開(kāi)關(guān)。由安森美半導(dǎo)體公司制造生產(chǎn)的NCP1381AC DC 轉(zhuǎn)換器，離線開(kāi)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(kāi)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(lái)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(jiàn)“開(kāi)關(guān)轉(zhuǎn)換器，SMPS 變壓器”標(biāo)題。

Housed in a SO--14 package, the NCP1381/82 includes everything

needed to build rugged and efficient Quasi--Resonant (QR) Switching

Power Supplies. When powered by a front--end Power Factor

Correction circuitry, the NCP1381/82 automatically disconnects the

PFC controller in low output loading conditions (with an adjustable

level), thus improving the standby power. This is particularly well

suited for medium to high power offline applications, e.g. notebook

adapters.When the current setpoint falls below a given value, e.g. the

output power demand diminishes, the IC automatically enters the

so--called skip cycle mode and provides excellent efficiency at light

loads. Because this occurs at an adjustable low peak current together

with a proprietary Soft--Skipt technique, no acoustic noise takes

place. Skip cycle also offers the ability to easily select the maximum

switching frequency at which foldback and standby take place.

The NCP1381/82 also features several efficient protection options

like a) a short--circuit / overload detection independent of the auxiliary

voltage b) an auto--recovery brown--out detection and c) an input to

externally latch the circuit in case of Overvoltage Protection or Over

Temperature Protection.

Features

? Current--Mode Quasi--Resonant Operation

? Adjustable Line Over Power Protection

? Extremely Low Startup Current of 15 mAMaximum

? Soft--Skip Cycle Capability at Adjustable Peak Currents

? Plateau Sensing Overvoltage

? Brown--Out Protection

? Maximum tON Limitation

? Overpower Protection by current Sense Offset

? Internal 5 ms Soft--Start Management

? Short--Circuit Protection Independent from Auxiliary Level

? External Latch Input Pin for an OTP Signal

? Go--To--Standby Signal for the PFC Front Stage

? True Frequency (tON + tOFF) Clamp Circuit

? Low and Noiseless, No--Load Standby Power

? Internal Leading Edge Blanking

? +500 mA / --800 mA Peak Current Drive Capability

? 5 V / 10 mA Reference Voltage

? These are Pb--Free Devices

Typical Applications

? High Power AC/DC Adapters for Notebooks, etc

? Offline Battery Chargers

? Set--Top Boxes Power Supplies, TV, Monitors, etc