LM317LMX datasheet(8/37 Pages) TI1

Part #	LM317LMX

Description	3-Terminal Adjustable Regulator

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8

LM317L-N

SNVS775K – MARCH 2000 – REVISED APRIL 2016

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7 Detailed Description

7.1 Overview

In operation, the LM317L-N develops a nominal 1.25-V reference voltage, VREF, between the output and

adjustment terminal. The reference voltage is impressed across program resistor R1 and, because the voltage is

constant, a constant current I1 then flows through the output set resistor R2, giving an output voltage of:

(1)

Because the 100-

μA current from the adjustment terminal represents an error term, the LM317L-N was designed

to minimize IADJ and make it very constant with line and load changes. To do this, all quiescent operating current

is returned to the output establishing a minimum load current requirement. If there is insufficient load on the

output, the output will rise.

Figure 13. Typical Application Circuit for Adjustable Regulator

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