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LT1681 - 典型应用图例：
LT1681典型应用图例一
LT1681 - 封装图解：
LT1681封装图解一
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LINEAR产品 - LT1681介绍

LT1681 - LT1681是Dual Transistor Synchronous Forward Controller

LT1681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，LT1681是LT1681是Dual Transistor Synchronous Forward Controller，本站介绍了LT1681的封装应用图解、特点和优点、功能等，并给出了与LT1681相关的LINEAR元器件型号供参考。

LT1681 - LT1681是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

LT1681 - Dual Transistor Synchronous Forward Controller

LT1681 - Dual Transistor Synchronous Forward Controller - Linear Technology（凌力尔特）

功能描述

The LT1681 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 LT1681’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 LT1681 incorporates a soft-start feature that provides a controlled increase in supplied current during start-up and after an undervoltage lockout or overvoltage/overcurrent event.

The part is available in a 20-lead wide SO package to support high voltage pin-to-pin clearance.

特点
  • High Voltage: Operation Up to 72V
  • Synchronizable Operating Frequency and Output Switch Phase for Multiple Controller Systems
  • Fixed Frequency Operation to 350kHz
  • Adaptive and Adjustable Blanking
  • Synchronous Rectifier Driver
  • Local 1% Voltage Reference
  • Undervoltage Lockout Protection with Hysteresis
  • Input Overvoltage Protection
  • Programmable Start Inhibit
  • Transformer Primary Saturation Protection
  • Optocoupler Feedback Support
  • Soft-Start Control
    • 应用
  • Isolated Telecommunication Systems
  • Personal Computers and Peripherals
  • 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)
    LT1681ESW SW-20 E $5.92 $5.00
    LT1681ESW#PBF SW-20 E $5.92 $5.00
    LT1681ESW#TR SW-20 E $5.10
    LT1681ESW#TRPBF SW-20 E $5.10
    LT1681ISW SW-20 I $6.51 $5.50
    LT1681ISW#PBF SW-20 I $6.51 $5.50
    LT1681ISW#TR SW-20 I $5.60
    LT1681ISW#TRPBF SW-20 I $5.60
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  • LT1952 - 单开关同步正激控制器
  • LTC3766 - 高效率、副端同步正激式控制器
  • LTC3723-1 - Synchronous Push-Pull PWM Controllers
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