NCP1342中文资料准谐振反激式控制器，带谷值锁定开关数据手册ONSEMI规格书

描述 Description

The NCP1342 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 NCP1342 can enable no-load power consumption below 30 mW.

The NCP1342 features proprietary valley-lockout circuitry, ensuring stable valley switching.This system works down to the 6th valley and transitions to frequency foldback mode to reduce switching losses.As the load decreases further, the NCP1342 enters quiet-skip mode to manage the power delivery while minimizing acoustic noise.

To ensure light load performance with high frequency designs, the NCP1342 incorporates Minimum Peak Current Modulation (MPCM) to reduce the switching frequency quickly.To help ensure converter ruggedness, the NCP1342 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 overvoltage and NTC-ready overtemperature protection through a dedicated pin, and line removal detection to safely discharge the X2 capacitors when the ac line is removed.

特性 Features

• Minimum Peak Current Modulation for Rapid Frequency Foldback (RFF)
• Fast reduction of switching frequency for improved light load efficiency
• QR Frequency Jittering
• Reduces EMI Signature
• Quiet-Skip Technology
• Ensures Operation Outside Audible Range
• Integrated HV Startup with Brownout Protection
• Provides an efficient power-on source and protects against drops in input mains voltage
• Valley Switching Operaton with Valley Lockout
• Maximizes the efficiency over the entire power range
• Integrated X2 Capacitor Discharge Capability
• Eliminates the need for a X2 resistor
• 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 implementation
• Simple implementation of required protection functions

应用 Application

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

简介

NCP1342属于集成电路（IC）的ACDC转换器离线开关。由制造生产的NCP1342AC 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。