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conceptually, a series voltage regulator is simply a device that controls how much current to deliver to the load via negative feedback. The current is controlled using a transistor, which is really just a voltage controlled current source. The voltage feedback is usually compared to some sort of internal voltage reference generated in the voltage regulator chip. Adjustable regulator allows you to use a resistive network to set (or adjust) the voltage reference on-chip.
This is of course a very hand-wavy explanation of voltage regulators but I really don't want to go into the semiconductor physics and the internal workings of a voltage regulator.
Hi,
A series voltage regulator works in series with the load resistance. It senses the volatge across the load and using negative feedback, adjusts the voltage drop across it such that the voltage across the load is kept constant. It corrects for voltage variation across the load both due to changes in load current (Load Regulation) and due to changes in input voltage (Line Regulation).
Regards, Laktronics
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