LM317SSLASHNOPB datasheet(12/51 Pages) TI

tên linh kiện	LM317S/NOPB

Giải thích chi tiết về linh kiện	LM117, LM317-N Wide Temperature Three-Pin Adjustable Regulator

PDF	51 Pages

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nhà sản xuất	TI [Texas Instruments]

Trang chủ	http://www.ti.com

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LM317-N

( )

OUT

ADJ

= 1.25 V

LM117, LM317-N

SNVS774Q – MAY 2004 – REVISED JUNE 2020

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Product Folder Links: LM117 LM317-N

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8 Detailed Description

8.1 Overview

In operation, the LM317-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 calculated

by Equation 1:

(1)

Figure 15. Setting the VOUT Voltage

Because the 100-μA current from the adjustment terminal represents an error term, the LM317-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.

LM317S/NOPB bảng dữ liệu(PDF) 12 Page - Texas Instruments