NCP1381集成电路（IC）的ACDC转换器离线开关规格书PDF中文资料

NCP1381属于集成电路（IC）的ACDC转换器离线开关。由安森美半导体公司制造生产的NCP1381AC 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。

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