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参数资料
| 型号： | LM3875MDC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 56 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC |
| 封装： | DIE |
| 文件页数： | 18/21页 |
| 文件大小： | 582K |
| 代理商： | LM3875MDC |
External Components Description (Figure 1 and Figure 2) (Continued)
Components
Functional Description
8.
*Ci
Feedback capacitor. Ensures unity gain at DC. Also a low frequency pole (highpass roll-off) at:
f
c = 1/(2π Ri Ci).
9.
R
f1
Feedback resistance to provide AC Gain in conjunction with Ri.
10.
*R
f2
At higher frequencies feedback resistance works with C
f to provide lower AC Gain in conjunction with Rf1
and Ri. A high frequency pole (lowpass roll-off) exists at:
f
c =[Rf1 Rf2](s+1/Rf2 Cf]/[(Rf1 +Rf2)(s+1/Cf (Rf1 +Rf2))].
11.
*C
f
Compensation capacitor that works with R
f1 and Rf2 to reduce the AC Gain at higher frequencies.
12.
*R
SN
Works with C
SN to stabilize the output stage by creating a pole that eliminates high frequency oscillations.
13.
*C
SN
Works with R
SN to stabilize the output stage by creating a pole that eliminates high frequency
oscillations.
f
c = 1/(2πRSN CSN).
14.
*L
Provides high impedance at high frequencies so that R may decouple a highly capacitive load and reduce
the Q of the series resonant circuit due to capacitive load. Also provides a low impedance at low
frequencies to short out R and pass audio signals to the load.
15.
*R
16.
C
S
Provides power supply filtering and bypassing.
*Optional components dependent upon specific design requirements. Refer to the Application Information section for more information.
OPTIONAL EXTERNAL COMPONENT INTERACTION
Although the optional external components have specific desired functions that are designed to reduce the bandwidth and elimi-
nate unwanted high frequency oscillations they may cause certain undesirable effects when they interact. Interaction may occur
for components whose reactances are in close proximity to one another. One example would be the coupling capacitor, C
C, and
the compensation capacitor, C
f. These two components act as low impedances to certain frequencies which will couple signals
from the input to the output. Please take careful note of basic amplifier component functionality when designing in these compo-
nents.
The optional external components shown in
Figure 2 and described above are applicable in both single and split voltage supply
configurations.
Typical Performance Characteristics
Safe Area
DS011449-17
SPiKe
Protection Response
DS011449-18
Supply Current vs
Supply Voltage
DS011449-19
LM3875
www.national.com
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3875T | 功能描述:IC AMP AUDIO PWR 56W 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) |
| LM3875T | 制造商:Texas Instruments 功能描述:IC AMP AUDIO 100W 3875 SIL-11 |
| LM3875T/NOPB | 制造商:Texas Instruments 功能描述:Audio Amp Speaker 1-CH Mono 56W Class-AB 11-Pin(11+Tab) TO-220 |
| LM3875TF | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| LM3875TF/NOPB | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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