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Application Notes

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  2-Wire Virtual Remote Sensing for Voltage Regulators - Clairvoyance Marries Remote Sensing &mdash AN126
  PDF, 1.4 Мб, Файл опубликован: 1 окт 2010
  Wires and connectors have resistance. This simple, unavoidable truth dictates that a power source’s remote load voltage will be less than the source’s output voltage. Traditional methods for countering this include increasing the power source voltage and "4-wire" remote voltage sensing. Both have limitations. A new IC based approach achieves "virtual" remote sensing at the load without adding the usual two extra sense wires. Numerous circuit examples show the IC working with various voltage regulators and remote loads. Appendices detail IC internal operation and design guidelines for applying the part in any regulator circuit.
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  Application Note 126
  October 2010
  2-Wire Virtual Remote Sensing for Voltage Regulators
  Clairvoyance Marries Remote Sensing
  Jim Williams, Jesus Rosales, Kurk Mathews, Tom Hack
  Introduction
  Wires and connectors have resistance. This simple, unavoidable truth dictates that a power source’s remote load
  voltage will be less than the source’s output voltage. Figure 1
  shows this, and implies that intended load voltage can
  be maintained by raising regulator output. Unfortunately,
  line resistance and load variations introduce uncertainties,
  limiting achievable performance.
  WIRING DROPS POWER
  SUPPLY LOAD
  AN125 F01 WIRING DROPS Figure 1. Unavoidable Wiring Drops Cause Low Load
  Voltage. Line and Load Resistance Variations Introduce
  Additional Load Voltage Uncertainty, Mitigating Against
  Compensation by Raising Supply Voltage LOAD
  VOLTAGE
  REGULATOR POWER
  SUPPLY LOAD
  AN125 F02 Figure 2. Local Regulation Stabilizes
  Load Voltage But is Inefп¬Ѓcient VOUT+ VOLTAGE DROP Figure 2 illustrates one compensatory approach. Locally …

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• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Internal Power Switch Buck