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LM317KTER Scheda tecnica(PDF) 8 Page - Texas Instruments

Il numero della parte LM317KTER
Spiegazioni elettronici  3-Terminal Adjustable Regulator
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Over Temp &
Over Current
Protection
Input
Adj.
Output
1.25 V
Iadj
LM317
SLVS044W – SEPTEMBER 1997 – REVISED OCTOBER 2014
www.ti.com
8 Detailed Description
8.1 Overview
The LM317 device is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5
A over an output-voltage range of 1.25 V to 37 V. It requires only two external resistors to set the output voltage.
The device features a typical line regulation of 0.01% and typical load regulation of 0.1%. It includes current
limiting, thermal overload protection, and safe operating area protection. Overload protection remains functional
even if the ADJUST terminal is disconnected.
The LM317 device is versatile in its applications, including uses in programmable output regulation and local on-
card regulation. Or, by connecting a fixed resistor between the ADJUST and OUTPUT terminals, the LM317
device can function as a precision current regulator. An optional output capacitor can be added to improve
transient response. The ADJUST terminal can be bypassed to achieve very high ripple-rejection ratios, which are
difficult to achieve with standard three-terminal regulators.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 NPN Darlington Output Drive
NPN Darlington output topology provides naturally low output impedance and an output capacitor is optional. To
support maximum current and lowest temperature, 3-V headroom is recommended (VI – VO).
8.3.2 Overload Block
Over-current and over-temperature shutdown protects the device against overload or damage from operating in
excessive heat.
8.3.3 Programmable Feedback
Op amp with 1.25-V offset input at the ADJUST terminal provides easy output voltage or current (not both)
programming. For current regulation applications, a single resistor whose resistance value is 1.25 V/IO and power
rating is greater than (1.25 V)2/R should be used. For voltage regulation applications, two resistors set the output
voltage.
8
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Copyright © 1997–2014, Texas Instruments Incorporated
Product Folder Links: LM317


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