基于LT4180設計的精密負載調整電源方案

Linear公司的LT4180是全特性電源控制器,集成有5mA光隔離器,欠壓/過壓鎖住,軟起動和±1%內(nèi)部基準電壓. LT4180的虛擬遙測特性包括用戶編程的抖動頻率和擴展頻譜抖動.輸入電壓從3.1V到50V,主要用在12V高強亮度燈,28V工業(yè)系統(tǒng),大于40W的CAT5電纜系統(tǒng),AC和DC適配器,井下采集和其它遙控儀表等.本文介紹了LT4180主要特性,方框圖以及典型應用電路,包括12V/500mA線性穩(wěn)壓器電路圖, 12V/600mA升壓穩(wěn)壓器電路圖和3.3V隔離反激穩(wěn)壓器電路圖.

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應用:

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

圖1.LT4180方框圖

圖2.LT4180隔離電源框圖


圖3.LT4180 12V/500mA線性穩(wěn)壓器電路圖

圖4.LT4180 12V/600mA升壓穩(wěn)壓器電路圖

圖5.LT4180 3.3V隔離反激穩(wěn)壓器電路圖