NCP1341中文资料准谐振控制器，高电压，具有带功率偏移模式 (PEM) 的谷锁闭开关功能数据手册ONSEMI规格书

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

应用 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

简介

NCP1341属于集成电路（IC）的ACDC转换器离线开关。由制造生产的NCP1341AC 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。