NCP1079A数据手册集成电路（IC）的ACDC转换器离线开关规格书PDF

描述 Description

The NCP1079A & NCP1079B products integrate a fixed frequency current mode controller with a 700 V MOSFET. Available in a two different pin out of the very common PDIP 7 package, it offers a high level of integration, including soft start, frequency jittering, short circuit protection, skip cycle, a maximum peak current set point, ramp compensation, and a dynamic self supply (DSS, eliminating the need for an auxiliary winding).Unlike other monolithic solutions, the NCP1079A & NCP1079B is quiet by nature: during nominal load operation, the part switches at one of the available frequencies (65 or 100 kHz). When the output power demand diminishes, the IC automatically enters frequency foldback mode and provides excellent efficiency at light loads. When the power demand reduces further, it enters into a skip mode to reduce the standby consumption down to a no load condition.Protection features include: a timer to detect an overload or a short circuit event, Over voltage Protection with auto recovery. Ac input line voltage detection prevents lethal runaway in low input voltage conditions (Brown-out) as well as too high an input line (Ac line Over voltage Protection). This also allows an Over power Protection to compensate all internal delays in high input voltage conditions and optimize the maximum output current capability.For improved standby performance, the connection of an auxiliary winding stops the DSS operation and helps to reduce input power consumption below 50 mW at high line.

特性 Features

• Integrated 700 V MOSFET with RDS(on) of 2.7 Ω
• Up to 30W output SMPS design capability
• Current-Mode Fixed Frequency Operation (65 & 100 kHz)- 130 kHz for B version only
• Ability to scale for efficiency or size
• Peak Current: NCP1079A/B = 1,050mA
• Adjust output current protection based on output power demand
• Skip-Cycle Operation at Low Peak Current
• Eliminate acoustic noise
• Dynamic Self-Supply (DSS)
• Eliminate Aux winding
• Auto-Recovery Output Short Circuit Protection with Timer-Based Detection
• Provides more robust protection without worrying about the coupling of the aux winding
• Frequency Foldback Operation
• Improved efficiency at light load / Improved EMI over the entire load
• 300 µA No Load Power Consumption
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• Frequency Jittering (including during frequency foldback mode)
• Better EMI Signature Over the Entire Operating Range
• Adjustable Brown-out Protection and OVP
• Enhanced Protection Against too Low or too High Input Voltage
• Over Power Protection
• Higher Protection of the load in wide Mains Conditions
• 2nd Level Current Protection
• Protection in case of secondary diode short

应用 Application

• Auxiliary & Standby Power Supply
• Major Home Appliances power supplies
• Low to medium Power Chargers & Adapters
• White Goods
• E-Meters
• Industrial
• Consumer Equipment Power Supply

简介

NCP1079A属于集成电路（IC）的ACDC转换器离线开关。由制造生产的NCP1079AAC 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。