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.

Features

• Fixed−Frequency Current−Mode Operation 65 kHz or 100 kHz

Frequency Options

• Frequency Foldback then Skip Mode for Maximized Performance

in Light Load and Standby Conditions

• Timer−Based Overload Protection with Latched (Option A) or

Autorecovery (Option B) Operation

• High−Voltage Current Source with Brown−Out Detection and

Dynamic Self−Supply, Simplifying the Design of the VCC Circuitry

• Frequency Modulation for Softened EMI Signature

• Adjustable Overpower Protection Dependant on the Mains Voltage

• Fault Input for Overvoltage and Over Temperature Protection

• VCC Operation up to 28 V, with Overvoltage Detection

• 300/500 mA Source/Sink Drive Peak Current Capability

• 4/10 ms Soft−Start

• Internal Thermal Shutdown

• No−Load Standby Power < 30 mW

• X2 Capacitor in EMI Filter Discharging Feature

• These are Pb−Free Devices

Typical Applications

• Offline Adapters for Notebooks, LCD, and Printers

• Offline Battery Chargers

• Consumer Electronic Power Supplies

• Auxiliary/Housekeeping Power Supplies

• Offline Adapters for Notebooks

NCP12400属于集成电路（IC） > AC DC 转换器，离线开关。安森美半导体公司制造生产的NCP12400AC 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。