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參數(shù)資料
| 型號： | LM4731 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Stereo 25W Audio Power Amplifier with Mute and Standby Modes |
| 中文描述： | 立體聲25瓦音頻功率放大器靜音和待機模式 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 640K |
| 代理商： | LM4731 |
External Components Description
( See Figures 1 - 4 )
Components
R
B
Functional Description
1
Prevents currents from entering the amplifier’s non-inverting input which may be passed through to the load
upon power down of the system due to the low input impedance of the circuitry when the undervoltage
circuitry is off. This phenomenon occurs when the supply voltages are below 1.5V.
Inverting input resistance to provide AC gain in conjunction with R
f
.
Feedback resistance to provide AC gain in conjunction with R
i
.
Feedback capacitor which ensures unity gain at DC. Also creates a highpass filter with R
i
at f
C
= 1/(2
π
R
i
C
i
).
2
3
4
R
i
R
f
C
i
(Note 13)
C
S
5
Provides power supply filtering and bypassing. Refer to the Supply Bypassing application section for proper
placement and selection of bypass capacitors.
Acts as a volume control by setting the input voltage level.
6
R
V
(Note 13)
R
IN
(Note 13)
C
IN
(Note 13)
R
SN
(Note 13)
C
SN
(Note 13)
L (Note 13)
7
Sets the amplifier’s input terminals DC bias point when C
IN
is present in the circuit. Also works with C
IN
to
create a highpass filter at f
C
= 1/(2
π
R
IN
C
IN
). Refer to
Figure 4
.
Input capacitor which blocks the input signal’s DC offsets from being passed onto the amplifier’s inputs.
8
9
Works with C
SN
to stabilize the output stage by creating a pole that reduces high frequency instabilities.
10
Works with R
SN
to stabilize the output stage by creating a pole that reduces high frequency instabilities. The
pole is set at f
C
= 1/(2
π
R
SN
C
SN
). Refer to
Figure 4
.
Provides high impedance at high frequencies so that R may decouple a highly capacitive load and reduce
the Q of the series resonant circuit. Also provides a low impedance at low frequencies to short out R and
pass audio signals to the load. Refer to
Figure 4
.
Provides DC voltage biasing for the transistor Q1 in single supply operation.
Provides bias filtering for single supply operation.
Limits the voltage difference between the amplifier’s inputs for single supply operation. Refer to the
Clicks
and Pops
application section for a more detailed explanation of the function of R
INP
.
Provides input bias current for single supply operation. Refer to the
Clicks and Pops
application section for
a more detailed explanation of the function of R
BI
.
Establishes a fixed DC current for the transistor Q1 in single supply operation. This resistor stabilizes the
half-supply point along with C
A
.
11
12
R (Note 13)
13
14
15
R
A
C
A
R
INP
(Note 13)
R
BI
16
17
R
E
Note 13:
Optional components dependent upon specific design requirements.
L
www.national.com
6
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM4731TA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 25W Audio Power Amplifier with Mute and Standby Modes |
| LM4731TA/NOPB | 功能描述:IC AMP AUDIO PWR 25W AB TO220-15 RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4731TA/NOPB | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC |
| LM4732 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 50W Audio Power Amplifier with Mute |
| LM4732TA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 50W Audio Power Amplifier with Mute |
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