原标题：Linear LT4180精密负载调整电源方案

　　Linear 公司的LT4180是全特性电源控制器,集成有5mA光隔离器,欠压/过压锁住,软起动和±1%内部基准电压. LT4180的虚拟遥测特性包括用户编程的抖动频率和扩展频谱抖动.输入电压从3.1V到50V,主要用在12V高强亮度灯,28V工业系统,大于40W的CAT5电缆系统,AC和DC适配器,井下采集和其它遥控仪表等.本文介绍了LT4180主要特性,方框图以及典型应用电路,包括12V/500mA线性稳压器电路图, 12V/600mA升压稳压器电路图和3.3V隔离反激稳压器电路图.

　　The LT4180 solves the problem of providing tight load regulation over long, highly resistive cables without requiring an additional pair of remote sense wires. This Virtual Remote Sense™ device continuously interrogates the line impedance and corrects the power supply output voltage via its feedback loop to maintain a steady voltage at the load regardless of current changes.

　　The LT4180 is a full-featured controller with 5mA optoisolator sink capability, under/overvoltage lockout, soft-start and a ±1% internal voltage reference. The Virtual Remote Sense feature set includes user-programmable dither frequency and optional spread spectrum dither.

　　The LT4180 works with any topology and type of isolated or nonisolated power supply, including DC/DC converters and adjustable linear regulators.

　　The LT4180 is available in a 24-pin, SSOP package.

　　LT4180主要特性:

　　Tight Load Regulation with Highly Resistive Cables without Requiring Remote Sense Wiring

　　Compatible with Isolated and Nonisolated Power Supplies

　　±1% Internal Voltage Reference

　　5mA Sink Current Capability

　　Soft-Correct Reduces Turn-On Transients

　　Undervoltage and Overvoltage Protection

　　Pin-Programmable Dither Frequency

　　Optional Spread Spectrum Dither

　　Wide VIN Range: 3.1V to 50V

　　24-Pin SSOP Package

　　LT4180应用:

　　12V High Intensity Lamps

　　28V Industrial Systems

　　High Power (>40 Watts) CAT5 Cable Systems

　　Wiring Drop Cancellation for Notebook Computer Battery Charging

　　AC and DC Adaptors

　　Well-Logging and Other Remote Instrumentation

　　Surveillance Equipment

　　图1.LT4180方框图

　　图2.LT4180隔离电源框图

　　图3.LT4180 12V/500mA线性稳压器电路图

　　图4.LT4180 12V/600mA升压稳压器电路图

　　图5.LT4180 3.3V隔离反激稳压器电路图