LT3781 - LT3781是?Bootstrap? Start Dual Transistor Synchronous Forward Controller
LT3781是Linear公司的一款反激式、正激式和隔离式控制器产品，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相关的凌力尔特元器件型号供参考。
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 |
下面可能是您感兴趣的Linear Technology（凌力尔特）元器件
LT3748 - 100V 隔离型反激式控制器LTC3765 - 有源箝位正激式控制器和栅极驱动器LT1681 - Dual Transistor Synchronous Forward ControllerLTC3766 - 高效率、副端同步正激式控制器LT3758 - 高输入电压、升压、反激式、SEPIC 和负输出控制器LT3798 - 具备有源 PFC 功能的隔离型 No Opto 耦合器反激式控制器LTC3725 - Single-Switch Forward Controller and Gate DriverLTC3705 - 2-Switch Forward Controller and Gate DriverLT1952 - 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
下面可能是您感兴趣的Linear公司反激式、正激式和隔离式控制器元器件
LT1467L - LT1467L是Micropower Dual/Quad Precision Rail-to-Rail Input and Output Op AmpLT3506 - LT3506是双通道单片式 1.6A 降压型开关稳压器LT6020 - LT6020是双通道、微功率、5V/μs、精准轨至轨输出放大器LTC1408-12 - LTC1408-12是6 Channel, 12-Bit, 600ksps Simultaneous Sampling ADC with ShutdownLT1381 - LT1381是Low Power 5V RS232 Dual Driver/Receiver with 0.1µF CapacitorsLTC1405 - LTC1405是12-Bit, 5Msps, Sampling ADCLT1713 - LT1713是Single/Dual, 7ns, Low Power, 3V/5V/±5V Rail-to-Rail ComparatorsLTC4355 - LTC4355是具输入电源和熔丝监视器的正高电压理想二极管“或”控制器LT1460DCN8-5 - LT1460DCN8-5是微功率、精准串联基准系列RH118H - RH118H是精准、高速运算放大器
