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基于LT4180设计的精密负载调整电源方案
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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
[p]
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
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
[p]
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
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