UC2851中文资料具有 -40°C 至 85 °C 工作温度范围的 32V、1A、0.5MHz 离线式 PWM 控制器数据手册TI规格书

描述 Description

The UC1851 family of PWM controllers are optimized for off-line primary side control. These devices include a high current totem pole output stage and a toggle flip-flop for absolute 50% duty cycle limiting. In all other respects this line of controllers is pin for pin compatible with the UC1841 series. Inclusion of all major housekeeping functions in these high performance controllers makes them ideal for use in cost sensitive applications. Important features of these controllers include low current start-up, linear feed-forward for constant volt-second operation, and compatibility with both voltage or current mode control. In addition, these devices include a programmable start threshold, as well as programmable over-voltage, under-voltage, and over current fault thresholds. The fault latch on these devices can be configured for automatic restart, or latched off response to a fault. These devices are packaged in 18-pin plastic or ceramic dual-in-line packages, or for surface mount applications, a 20 Pin PLCC. The UC1851 is characterized for -55°C to +125°C operation while the UC2851 and UC3851 are designed for -40°C to +85°C and 0°C to +70°C, respectively.

特性 Features

• All Control, Driving, Monitoring, and Protection Functions Included
• Low-Current Off Line Start Circuit
• Voltage Feed Forward or Current Mode Control
• High Current Totem Pole Output
• 50% Absolute Max Duty Cycle
• PWM Latch for Single Pulse Per Period
• Pulse-by-Pulse Current Limiting plus Shutdown for Over-Current Fault
• No Start-Up or Shutdown Transients
• Slow Turn-On Both Initially and After Fault Shutdown
• Shutdown Upon Over or Under Voltage Sensing
• Latch Off or Continuous Retry After Fault
• 1% Reference Accuracy
• 500kHz Operation
• 18 Pin DIL or 20 Pin PLCC Package

简介

UC2851属于集成电路（IC）的ACDC转换器离线开关。由TI制造生产的UC2851AC 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。