Virtual Remote Sense Controller

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.

Applications

* 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

* 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