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LT3781 - 典型应用图例：
LT3781典型应用图例一
LT3781 - 封装图解：
LT3781封装图解一
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LINEAR产品 - LT3781介绍

LT3781 - LT3781是?Bootstrap? Start Dual Transistor Synchronous Forward Controller

LT3781是LINEAR凌力尔特公司的一款反激式、正激式和隔离式控制器产品，LT3781是LT3781是?Bootstrap? Start Dual Transistor Synchronous Forward Controller，本站介绍了LT3781的封装应用图解、特点和优点、功能等，并给出了与LT3781相关的LINEAR元器件型号供参考。

LT3781 - LT3781是?Bootstrap? Start Dual Transistor Synchronous Forward Controller - 反激式、正激式和隔离式控制器 - 电源管理 - 凌力尔特

LT3781 - ?Bootstrap? Start Dual Transistor Synchronous Forward Controller

LT3781 - ?Bootstrap? Start Dual Transistor Synchronous Forward Controller - Linear Technology（凌力尔特）

功能描述

The LT3781 controller simplifies the design of high power synchronous dual transistor forward DC/DC converters. The part employs fixed frequency current mode control and supports both isolated and nonisolated topologies. The IC drives external N-channel power MOSFETs and operates with input voltages up to 72V.

The LT3781 is ideal for output derived power schemes, through the use of a large undervoltage lockout hysteresis range. The part is also equipped with an 18V VCC shunt regulator, which prevents exceeding absolute maximum ratings while in trickle start applications.

The LT3781’s operating frequency is programmable and can be synchronized up to 350kHz. Switch phase is also controlled during synchronized operation to accommodate multiple-converter systems. Internal logic guarantees 50% maximum duty cycle operation to prevent transformer saturation.

The LT3781 is available in a 20-lead SSOP package.

特点
  • High Voltage Operation up to 72V
  • Synchronizable Operating Frequency and Output Switch Phase for Multiple Controller Systems
  • Synchronous Switch Output
  • Undervoltage Lockout Protection with 6V Hysteresis for Self-Biased Power
  • Fixed Frequency Operation to 350kHz
  • Local 1% Voltage Reference
  • Input Overvoltage Protection
  • Low Start-Up Current
  • Programmable Start Inhibit for Power Supply Sequencing and Protection
  • Optocoupler Support
  • Soft-Start Control
    • 应用
  • Isolated Telecommunication Systems
  • Personal Computers and Peripherals
  • Distributed Power Step-Down Converters
  • Lead Acid Battery Backup Systems
  • Automotive and Heavy Equipment
    • 以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）
    器件型号 封装 温度 价格 (以 1 ~ 99 片为批量) 价格 (以 1000 片为批量)
    LT3781EG SSOP-20 E $7.14 $4.95
    LT3781EG#PBF SSOP-20 E $7.14 $4.95
    LT3781EG#TR SSOP-20 E $5.05
    LT3781EG#TRPBF SSOP-20 E $5.05
    LT3781IG SSOP-20 I $7.86 $5.45
    LT3781IG#PBF SSOP-20 I $7.86 $5.45
    LT3781IG#TR SSOP-20 I $5.55
    LT3781IG#TRPBF SSOP-20 I $5.55
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  • LT1681 - Dual Transistor Synchronous Forward Controller
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  • LTC3725 - Single-Switch Forward Controller and Gate Driver
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  • LT1952 - 单开关同步正激控制器
  • LTC3722-1 - 同步、双模式、相位调制的全桥式控制器
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