LT4180是全特性電源控制器,集成有5mA光隔離器,欠壓/過(guò)壓鎖住,軟起動(dòng)和±1%內(nèi)部基準(zhǔn)電壓. LT4180的虛擬遙測(cè)特性包括用戶編程的抖動(dòng)頻率和擴(kuò)展頻譜抖動(dòng).輸入電壓從3.1V到50V,主要用在12V高強(qiáng)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(yīng)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(yīng)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
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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