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Design Notes

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  Control the Voltage of a Remote Load Over Any Length of Copper Wire &mdash DN529
  PDF, 190 Kb, File published: Jul 8, 2014
  Extract from the document

  Control the Voltage of a Remote Load Over Any Length
  of Copper Wire – Design Note 529
  Philip Karantzalis
  Introduction
  A common problem in power distribution systems is
  loss of regulation due to the cable/wire voltage drop
  between the regulator and the load. Any increase in
  wire resistance, cable length or load current increases
  the voltage drop over the distribution wire, increasing
  the difference between actual voltage at the load and
  the voltage perceived by the regulator. One way to
  improve regulation over long cable runs is to measure
  voltage directly at the load via a 4-wire Kelvin connection between the regulator and the load. Unfortunately,
  this solution requires routing additional wires to the
  load as well as a Kelvin resistor placed near the load,
  impractical when the load is inaccessible for modification. Another method minimizes the voltage drop by
  employing large diameter wire, lowering the resistance
  from the regulator to the load. This is electrically simple,
  but can be mechanically complicated. Increasing the
  size of cable conductors can significantly increase
  space requirements and cost. The LT6110 Cable/Wire Compensator
  Figure 1 shows a 1-wire compensation block diagram.
  If the remote load circuit does not share the regulator’s ground, two wires are required, one to the load …

Articles

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  Compensate for Wire Drop to a Remote Load &mdash LT Journal
  PDF, 117 Kb, File published: Oct 27, 2014
  Extract from the document

  design ideas Compensate for Wire Drop to a Remote Load
  Philip Karantzalis A common problem in power distribution systems is degradation of regulation due to the
  wire voltage drop between the regulator and the load. Any increase in wire resistance,
  cable length or load current increases the voltage drop over the distribution wire, increasing
  the difference between voltage at the load and the voltage programmed by the regulator.
  Remote sensing requires routing additional wires to the load. No extra wiring is required
  with the LT6110 cable/wire drop compensator. This article shows how the LT6110 can
  improve regulation by compensating for a wide range of regulator-to-load voltage drops.
  THE LT6110 CABLE/WIRE
  COMPENSATOR Figure 1 shows a 1-wire compensation
  block diagram. If the remote load circuit
  does not share the regulator’s ground,
  two wires are required, one to the load
  and one ground return wire. The LT6110
  high side amplifier senses the load current by measuring the voltage, VSENSE ,
  across the sense resistor, RSENSE , and sinks
  a current, IIOUT, proportional to the load
  current, ILOAD. IIOUT scale factor is programmable with the RIN resistor from
  10Вµ A to 1m A. Wire voltage drop, VDROP,
  compensation is accomplished by sinking
  IIOUT through the RFA feedback resistor
  to increase the regulator’s output by an
  amount equal to VDROP. An LT6110 cable/ Figure 1. No extra wires are required to compensate …

Model Line

Manufacturer's Classification

• Monitor, Control and Protection > Cable Drop Compensation
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) System Monitor

Other Names:

LT6110IDCTRMPBF, LT6110IDC TRMPBF