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LM317MDCYG3 Datasheet(数据表) 7 Page - Texas Instruments

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部件型号  LM317MDCYG3
说明  3-TERMINAL ADJUSTABLE REGULATOR
下载  12 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
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 7 page
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APPLICATION INFORMATION
LM317M
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 possiblility 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)
LM317M
3-TERMINAL ADJUSTABLE REGULATOR
SLVS297O – APRIL 2000 – REVISED JULY 2006
Figure 14. Adjustable Voltage Regulator
7
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