參數(shù)資料
型號： LM4817
廠商： National Semiconductor Corporation
元件分類： 圓形連接器
英文描述： Circular Connector; MIL SPEC:MIL-C-5015; Body Material:Metal; Series:GT; No. of Contacts:85; Connector Shell Size:40; Connecting Termination:Crimp; Circular Shell Style:Wall Mount Receptacle; Body Style:Straight
中文描述： 1W的立體聲音頻放大器以及可調(diào)節(jié)輸出限加可調(diào)穩(wěn)壓器
文件頁數(shù)： 11/21頁
文件大?。?/td> 738K
代理商： LM4817
LDO Typical Performance Characteristics
Unless otherwise specified, V
IN
= V
OUT
+ 0.5V, C
IN
=
C
OUT
= 2.2μF, C
CC
= 33nF, T
J
= 25C, V
SHDN
= V
IN
. (Continued)
Power-Up Response
Power-Down Response
200781B4
200781B5
External Components Description
(Refer to
Figure 1
).
Components
1.
Functional Description
R
i
The Inverting input resistance, along with R
f
, set the closed-loop gain. R
i
, along with C
i
, form a high pass
filter with f
c
= 1/(2
π
R
i
C
i
).
The input coupling capacitor blocks DC voltage at the amplifier’s input terminals. C
i
, along with R
i
, create a
highpass filter with f
c
= 1/(2
π
R
i
C
i
). Refer to the section,
SELECTING PROPER EXTERNAL
COMPONENTS
, for an explanation of determining the value of C
i
.
The feedback resistance, along with R
i
, set the closed-loop gain.
The supply bypass capacitor. Refer to the
POWER SUPPLY BYPASSING
section for information about
properly placing, and selecting the value of, this capacitor.
The capacitor, C
B
, filters the half-supply voltage present on the BYPASS pin. Refer to the
SELECTING
PROPER EXTERNAL COMPONENTS
section for information concerning proper placement and selecting
C
B
’s value.
Combined with R
2
, sets the LDO’s output voltage according to the following equation:
R
1
= R
2
((V
OUT
/ 1.25V) -1)
Combined with R
1
, sets the LDO’s output voltage according to the following equation:
R
2
= (1.25V x R
1
) / (V
OUT
- 1.25V)
2.
C
i
3.
4.
R
f
C
s
5.
C
B
6.
R
1
7.
R
2
L
www.national.com
11
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