App note: 2-wire virtual remote sensing for voltage regulators

Posted on Sunday, August 5th, 2012 in app notes by DP

Here is an app note from Linear Technology describing the use of virtual remote sensing of wiring voltage drops in power supply designs.

Here, the LT4180 Virtual Remote Sense™ (VRS) IC alternates output current between 95% and 105% of the nominal required output current. The LT4180 forces the power supply to provide a DC current plus a small square wave current with peak-to-peak amplitude equal to 10% of the DC current. Decoupling capacitor CLOAD, normally required for low impedance under transient conditions in non-VRS systems, takes an additional role by fi ltering out the VRS square wave excursions.



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