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100 mA adjustable linear regulator

LM317L Internal Circuitry

Explore the internal circuitry and functional stages of LM317L.

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Inside LM317L

A floating reference and pass stage inside a compact IC outline.

LM317L cutaway: input feeds a protected pass stage, error amplifier compares output minus adjust with a reference.
Functional architecture; physical die layout and exact transistor implementation vary by chip revision.

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Select a stage to see its role and connections

Compare

Compare OUTPUT minus ADJUST with the internal reference.

Regulate

Drive the series pass stage to correct the voltage error.

Protect

Current and thermal controls constrain overloads.

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