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Cable drop compensator eliminates need for sense wires

Posted: 19 Apr 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Linear? cable drop compensator? USB? PoE?

A new device that improves voltage regulation at remote loads without the need for Kelvin sense wires has been rolled out by Linear Technology. The LT6110 cable drop compensator has been designed for use with most types of voltage regulators and can provide several volts of load regulation compensation.

The company's latest device will compensate for the voltage drop due to resistance in a wire, circuit board trace or cable and can improve regulation at the load by a factor of 10. It operates with supply voltages that range from 2V to 50V, making it suitable for high power USB, Power over Ethernet (PoE), remote instrumentation and remote industrial applications. The LT6110 reduces costs by eliminating sense wires which may be prone to misconnection or damage and it makes load regulation independent of wire size or length.

The LT6110 operates by measuring the load current with a sense resistor and injecting current into the existing regulator's feedback loop to raise the output voltage. It is designed to work with standard feedback circuits, as well as new "current source" reference devices such as the LT3080. For load currents less than 3A, the internal 20mOhm sense resistor simplifies the design. Wide bandwidth achieves fast transient compensation of load steps, and in most cases the savings in wire and labour are more than the cost of the LT6110.

The LT6110 is fully specified for operation from C40C to 125C and is offered in SOT23 and 2mm x 2mm DFN packages.

Further information about the LT6110 can be found here.

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