LM317MDCYG3 Datasheet

  • LM317MDCYG3

  • 3-TERMINAL ADJUSTABLE REGULATOR

  • 183.04KB

  • 11页

  • TI

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LM317M
3-TERMINAL ADJUSTABLE REGULATOR
SLVS297M 鈥?APRIL 2000 鈥?REVISED OCTOBER 2005
APPLICATION INFORMATION
D1 (Note E)
1N4002
V
I
Input
LM317M
Output
V
O
(Note C)
Adjust
I
Adj
V
ref
= 1.25 V
R
1
240
鈩?/div>
D2 (Note E)
1N4002
C
O
(Note B)
1.0
碌F
C
i
(Note A)
0.1
碌F
R
2
C
ADJ
(Note D)
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-碌F disc or 1-碌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:
V
O
+
V
ref
1
)
R
2
R
1
)
(I
Adj
R
2
)
Because I
Adj
typically is 50
碌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.
Figure 14. Adjustable Voltage Regulator
7

LM317MDCYG3 产品属性

  • 80

  • 集成电路 (IC)

  • PMIC - 稳压器 - 线性

  • -

  • 正,可调式

  • 1.25 V ~ 37 V

  • 4.2 V ~ 40 V

  • -

  • 1

  • 500mA(最小值)

  • 500mA

  • 0°C ~ 125°C

  • 表面贴装

  • TO-261-4,TO-261AA

  • SOT-223-4

  • 管件

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