MC44603A中文资料Enhanced Mixed Frequency Mode GreenLine PWM Controller数据手册ONSEMI规格书

描述 Description

The MC44603A is an enhanced high performance controller that isspecifically designed for off−line and dc−to−dc converter applications.This device has the unique ability of automatically changing operating modes if the converter output is overloaded, unloaded, or shorted,offering the designer additional protection for increased system reliability. The MC44603A has several distinguishing features when compared to conventional SMPS controllers. These features consist of a foldback facility for overload protection, a standby mode when the converter output is slightly loaded, a demagnetization detection for reduced switching stresses on transistor and diodes, and a high current totem pole output ideally suited for driving a power MOSFET. It can also be used for driving a bipolar transistor in low power converters (< 150 W). It is optimized to operate in discontinuous mode but can also operate in continuous mode. Its advanced design allows use in current mode or voltage mode control applications.

特性 Features

Features
• This is a Pb−Free and Halide−Free Device\r

Current or Voltage Mode Controller
• Operation up to 250 kHz Output Switching Frequency
• Inherent Feed Forward Compensation
• Latching PWM for Cycle−by−Cycle Current Limiting
• Oscillator with Precise Frequency Control

High Flexibility
• Externally Programmable Reference Current
• Secondary or Primary Sensing7
• Synchronization Facility
• High Current Totem Pole Output
• Undervoltage Lockout with Hysteresis

Safety/Protection Features
• Overvoltage Protection Against Open Current and Open Voltage Loop
• Protection Against Short Circuit on Oscillator Pin
• Fully Programmable Foldback
• Soft−Start Feature
• Accurate Maximum Duty Cycle Setting
• Demagnetization (Zero Current Detection) Protection
• Internally Trimmed Reference
• Enhanced Output Drive

GreenLine Controller: Low Power Consumption in Standby Mode
• Low Startup and Operating Current
• Fully Programmable Standby Mode
• Controlled Frequency Reduction in Standby Mode\r
• Low dV/dT for Low EMI Radiations

简介

MC44603A属于集成电路（IC）的ACDC转换器离线开关。由ONSEMI制造生产的MC44603AAC 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。