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LM317KTER Scheda tecnica(PDF) 8 Page - Texas Instruments |
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LM317KTER Scheda tecnica(HTML) 8 Page - Texas Instruments |
8 / 32 page + 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 Submit Documentation Feedback Copyright © 1997–2014, Texas Instruments Incorporated Product Folder Links: LM317 |
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