LTC3705中文资料反激式、正激式和隔离式控制器数据手册ADI规格书

描述 Description

The LTC®3705 is a controller for a 2-switch forward converter and includes on-chip bottom and top gate drivers that do not require external transformers. For secondary-side control, combine the LTC3705 with the LTC3706 PolyPhase® secondary-side synchronous forward controller to create a complete forward converter using a minimum of discrete parts. A proprietary scheme is used to multiplex gate drive signals across the isolation barrier through a tiny pulse transformer. The on-chip rectifier and the same pulse transformer provide gate drive bias power.Alternatively, the LTC3705 can be used as a standalone voltage mode controller in a primary-side control architecture with optoisolator feedback. Voltage feedforward provides excellent line regulation and transient response.

特性 Features

·High-Speed Top and Bottom Gate Drivers for
·2-Switch Forward Converter
·On-Chip Rectifier and Self-Starting Architecture
·Eliminate Need for Separate Gate Drive Bias Supply
·Wide Input Voltage Supply Range: 18V to 80V
·Tolerant of 100V Input Voltage Transients
·Linear Regulator Controller for Fast Start-Up
·Precision UVLO with Adjustable Hysteresis
·Overcurrent Protection
·Volt-Second Limit Prevents Transformer Core Saturation
·Voltage Feedforward for Fast Transient Response
·Available in 16-Lead Narrow SSOP Package

应用 Application

·Isolated 48V Telecommunication Systems
·Internet Servers and Routers
·Distributed Power Step-Down Converters
·Automotive and Heavy Equipment

简介

LTC3705属于集成电路（IC）的ACDC转换器离线开关。由制造生产的LTC3705AC 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。