厂商：Freescale
类别：16位单片机
厂商：Littelfuse
类别：TVS变阻器
厂商：Panasonic
类别：PhotoMOS(MOSFET输出光电耦合器)
类别：高频设备
厂商：AKM
类别：数字音频DAC
厂商：Skyworks
类别：切换开关
我要询价我要收藏
特点High Voltage: Operation Up to 72VSynchronizable Operating Frequency and Output Switch Phase for Multiple Controller SystemsFixed Frequency Operation to 350kHzAdaptive and Adjustable BlankingSynchronous Rectifier DriverLocal 1% Voltage ReferenceUndervoltage Lockout Protection with HysteresisInput Overvoltage ProtectionProgrammable Start InhibitTransformer Primary Saturation ProtectionOptocoupler Feedback SupportSoft-Start Control典型应用描述The LT?1681 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.