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参数资料
| 型号： | LM4700T |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 30 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM11 |
| 封装： | TO-220, 11 PIN |
| 文件页数： | 19/19页 |
| 文件大小： | 997K |
| 代理商： | LM4700T |
External Components Description
Components
Functonal Description
1R
B
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.
2R
I
Inverting input resistance to provide AC gain in conjunction with R
F. Also creates a highpass filter with CI
at f
C = 1/(2
πR
ICI).
3R
F
Feedback resistance to provide AC gain in conjunction with R
I.
4C
Feedback capacitor which ensures unity gain at DC.
5C
S
Provides power supply filtering and bypassing. Refer to the Supply Bypassing application section for
proper placement and selection of bypass capacitors.
6R
V
Acts as a volume control by setting the input voltage level.
7R
IN
Sets the amplifier’s input terminals DC bias point when C
IN is present in the circuit. Also works with CIN to
create a highpass filter at f
C = 1/(2
πR
8C
IN
Input capacitor which blocks the input signal’s DC offsets from being passed onto the amplifier’s inputs.
9R
SN
Works with C
SN to stabilize the output stage by creating a pole that reduces high frequency instabilities.
The pole is set at f
C = 1/(2
πR
10
C
SN
Works with R
SN to stabilize the output stage by creating a pole that reduces high frequency instabilities.
11
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.
12
13
R
A
Provides DC voltage biasing for the transistor Q1 in single supply operation.
14
C
A
Provides bias filtering for single supply operation.
15
R
INP
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.
16
R
BI
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.
17
R
E
Establishes a fixed DC current for the transistor Q1 in single supply operation. This resistor stabilizes the
half-supply point along with C
A.
Note 15: Optional components dependent upon specific design requirements.
LM4700
www.national.com
9
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PDF描述 |
|---|---|
| LM4700TF/NOPB | 30 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM11 |
| LM4701MWC | 30 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC |
| LM4730TA/NOPB | 14 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| LM4731TA/NOPB | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4700T/NOPB | 制造商:Texas Instruments 功能描述: |
| LM4700TF | 制造商:Texas Instruments 功能描述:IC AMP + MUTE 30W 4700 TO-220-11 |
| LM4700TF | 制造商:Texas Instruments 功能描述:IC AMP + MUTE 30W 4700 TO-220-11 |
| LM4700TF/NOPB | 功能描述:IC AMP AUDIO PWR 30W AB TO220-11 RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Overture™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR) |
| LM4701 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:LM4701 Overture⑩ Audio Power Amplifier Series 30W Audio Power Amplifier with Mute and Standby Modes |
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