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LT1725 - 典型应用图例：
LT1725典型应用图例一
LT1725典型应用图例二
LT1725 - 封装图解：
LT1725封装图解一
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LINEAR产品 - LT1725介绍

LT1725 - LT1725是General Purpose Isolated Flyback Controller

LT1725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，LT1725是LT1725是General Purpose Isolated Flyback Controller，本站介绍了LT1725的封装应用图解、特点和优点、功能等，并给出了与LT1725相关的LINEAR元器件型号供参考。

LT1725 - LT1725是General Purpose Isolated Flyback Controller - 反激式、正激式和隔离式控制器 - 电源管理 - 凌力尔特

LT1725 - General Purpose Isolated Flyback Controller

LT1725 - General Purpose Isolated Flyback Controller - Linear Technology（凌力尔特）

功能描述
The LT1725 is a monolithic switching regulator controller specifically designed for the isolated flyback topology. It drives the gate of an external MOSFET and is generally powered from a third transformer winding. These features allow for an application input voltage limited only by external power path components. The third transformer winding also provides output voltage feedback information, such that an optoisolator is not required. Its gate drive capability coupled with a suitable external MOSFET can deliver load power up to tens of watts.

The LT1725 has a number of features not found on most other switching regulator ICs. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation. Its unique control circuitry can maintain regulation well into discontinuous mode in most applications. Optional load compensation circuitry allows for improved load regulation. An optional undervoltage lockout pin halts operation when the application input voltage is too low. An optional external capacitor implements a soft-start function. A 3V output is available at up to several mA for powering primary side application circuitry.

特点
  • Drives External Power MOSFET with External ISENSE Resistor
  • Application Input Voltage Limited Only by External Power Components
  • Senses Output Voltage Directly from Primary Side WindingNo Optoisolator Required
  • Accurate Regulation Without User Trims
  • Regulation Maintained Well into Discontinuous Mode
  • Switching Frequency from 50kHz to 250kHz with External Capacitor
  • Available in 16-Pin SO and SSOP Packages
  • Optional Load Compensation
  • Optional Undervoltage Lockout
    • 应用
  • Telecom Isolated Converters
  • Offline Isolated Power Supplies
  • Instrumentation Power Supplies
    • 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)
    LT1725CGN SSOP-16 C $3.55 $3.00
    LT1725CGN#PBF SSOP-16 C $3.55 $3.00
    LT1725CGN#TR SSOP-16 C $3.06
    LT1725CGN#TRPBF SSOP-16 C $3.06
    LT1725CS SO-16 C $3.43 $2.90
    LT1725CS#PBF SO-16 C $3.43 $2.90
    LT1725CS#TR SO-16 C $2.96
    LT1725CS#TRPBF SO-16 C $2.96
    LT1725IGN SSOP-16 I $4.14 $3.50
    LT1725IGN#PBF SSOP-16 I $4.14 $3.50
    LT1725IGN#TR SSOP-16 I $3.56
    LT1725IGN#TRPBF SSOP-16 I $3.56
    LT1725IS SO-16 I $4.03 $3.40
    LT1725IS#PBF SO-16 I $4.03 $3.40
    LT1725IS#TR SO-16 I $3.46
    LT1725IS#TRPBF SO-16 I $3.46
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  • LT3573 - 无需使用光耦合器的隔离型反激式转换器
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  • LT3575 - 无需使用光耦合器的隔离型反激式转换器
  • LT3511 - 单片式、高电压、隔离型反激式转换器
  • LT3825 - 具宽输入电源范围的隔离型无光隔离器同步反激式控制器
  • LT3757 - 升压、反激式、SEPIC 和负输出控制器
  • LT1425 - Isolated Flyback Switching Regulators
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