The NCP101X series integrates a fixed−frequency current−mode

controller and a 700 V MOSFET. Housed in a PDIP−7 or SOT−223

package, the NCP101X offers everything needed to build a rugged and

low−cost power supply, including soft−start, frequency jittering,

short−circuit protection, skip−cycle, a maximum peak current setpoint

and a Dynamic Self−Supply (no need for an auxiliary winding).

Unlike other monolithic solutions, the NCP101X is quiet by nature:

during nominal load operation, the part switches at one of the available

frequencies (65 − 100 − 130 kHz). 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 typically 1/4

of the maximum peak value, no acoustic noise takes place. As a result,

standby power is reduced to the minimum without acoustic noise

generation.

Short−circuit detection takes place when the feedback signal fades

away, e.g. in true short−circuit conditions or in broken Optocoupler

cases. External disabling is easily done either simply by pulling the

feedback pin down or latching it to ground through an inexpensive

SCR for complete latched−off. Finally soft−start and frequency

jittering further ease the designer task to quickly develop low−cost and

robust offline power supplies.

For improved standby performance, the connection of an auxiliary

winding stops the DSS operation and helps to consume less than

100 mW at high line. In this mode, a built−in latched overvoltage

protection prevents from lethal voltage runaways in case the

Optocoupler would brake. These devices are available in economical

8−pin dual−in−line and 4−pin SOT−223 packages.

Features

• Built−in 700 V MOSFET with Typical RDSon of 11 

and 22 

• Large Creepage Distance Between High−Voltage Pins

• Current−Mode Fixed Frequency Operation:

65 kHz – 100 kHz − 130 kHz

• Skip−Cycle Operation at Low Peak Currents Only:

No Acoustic Noise!

• Dynamic Self−Supply, No Need for an Auxiliary

Winding

• Internal 1.0 ms Soft−Start

• Latched Overvoltage Protection with Auxiliary

Winding Operation

• Frequency Jittering for Better EMI Signature

• Auto−Recovery Internal Output Short−Circuit

Protection

• Below 100 mW Standby Power if Auxiliary Winding

is Used

• Internal Temperature Shutdown

• Direct Optocoupler Connection

• SPICE Models Available for TRANsient Analysis

• These are Pb−Free and Halide−Free Devices

Typical Applications

• Low Power AC/DC Adapters for Chargers

• Auxiliary Power Supplies (USB, Appliances,TVs, etc.)

NCP1011ST100T3G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NCP1011ST100T3GAC 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。