NCP1340中文资料准谐振控制器，高电压，谷锁闭开关功能数据手册ONSEMI规格书

描述 Description

The NCP1340 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 NCP1340 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 NCP1340 enters quiet−skip mode to manage the power delivery. To help ensure converter ruggedness, the NCP1340 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

应用 Application

• Medium or High Power AC-DC Adapters
• Ultra High Density AC-DC Adapters
• Notebook Adpaters
• Flat TV SMPS
• Computer Power Supplies
• Phone and Tablet Adapters

简介

NCP1340属于集成电路（IC）的ACDC转换器离线开关。由制造生产的NCP1340AC 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。