Simplified Functional Diagram of the LMD18200 Current Sensing Circuitry


A simplified functional diagram of the current sensing circuitry of the LMD18200 is shown in the following schematic.

Current sensing circuit

According to the datasheet, LMD18200
has a unique feature circuitry that allow the sensing of current
through the load without affecting the supply or ground return lines.

A common method
for sensing the load current is to insert a small valued power resistor
in series with either the VCC supply or ground lines and detect the
voltage drop across this resistor.

(source: national.com)


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