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LM317 Scheda tecnica(PDF) 7 Page - Texas Instruments

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Il numero della parte LM317
Spiegazioni elettronici  3-TERMINAL ADJUSTABLE REGULATOR
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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LM317 Scheda tecnica(HTML) 7 Page - Texas Instruments

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APPLICATION INFORMATION
LM317
R1
240
IAdj
R2
Adjust
Ci (Note A)
0.1
µF
CO (Note B)
1.0
µF
VI
VO (Note C)
NOTES: A. Ci is not required, but is recommended, particularly if the regulator is not in close proximity to the power-supply filter
capacitors. A 0.1-
µF disc or 1-µF tantalum provides sufficient bypassing for most applications, especially when adjustment
and output capacitors are used.
B. CO improves transient response, but is not needed for stability.
C. VO is calculated as shown:
Because IAdj typically is 50 µA, it is negligible in most applications.
D. CADJ is used to improve ripple rejection; it prevents amplification of the ripple as the output voltage is adjusted higher. If
CADJ is used, it is best to include protection diodes.
E. If the input is shorted to ground during a fault condition, protection diodes provide measures to prevent the possibility of
external capacitors discharging through low-impedance paths in the IC. By providing low-impedance discharge paths for
CO and CADJ, respectively, D1 and D2 prevent the capacitors from discharging into the output of the regulator.
Output
Input
Vref = 1.25 V
V
O
+ Vref 1 )
R
2
R
1
) (IAdj
R
2)
D1 (Note E)
1N4002
D2 (Note E)
1N4002
CADJ (Note D)
LM317
3-TERMINAL ADJUSTABLE REGULATOR
SLVS044R – SEPTEMBER 1997 – REVISED APRIL 2007
Figure 1. Adjustable Voltage Regulator
7
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