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參數(shù)資料
| 型號： | 317MQ |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 3-TERMINAL ADJUSTABLE REGULATOR |
| 中文描述： | 三端可調穩(wěn)壓 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 216K |
| 代理商： | 317MQ |
www.ti.com
APPLICATION INFORMATION
LM317M
R
1
240
I
Adj
R
2
Adjust
C
i
(Note A)
0.1
μ
F
C
O
(Note B)
1.0
μ
F
V
I
V
O
(Note C)
NOTES: A. C
i
is not required, but is recommended, particularly if the regulator is not in close proximity
to the power-supply filter capacitors. A 0.1-
μ
F disc or 1-
μ
F tantalum provides sufficient
bypassing for most applications, especially when adjustment and output capacitors are used.
B. C
O
improves transient response, but is not needed for stability.
C. V
O
is calculated as shown:
Because I
Adj
typically is 50
μ
A, it is negligible in most applications.
D. C
ADJ
is used to improve ripple rejection; it prevents amplification of the ripple as the output voltage
is adjusted higher. If C
ADJ
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 C
O
and C
ADJ
, respectively, D1 and D2 prevent the
capacitors from discharging into the output of the regulator.
Output
Input
V
ref
= 1.25 V
V
O
V
ref
1
R
2
R
1
(
I
Adj
R
2
)
D1
(Note E)
1N4002
D2
(Note E)
1N4002
C
ADJ
(Note D)
LM317M
3-TERMINAL ADJUSTABLE REGULATOR
SLVS297O–APRIL 2000–REVISED JULY 2006
Figure 14. Adjustable Voltage Regulator
7
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|---|---|
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