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參數(shù)資料
| 型號(hào)： | LM3876MWC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 56 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC |
| 封裝： | WAFER |
| 文件頁數(shù)： | 20/22頁 |
| 文件大?。?/td> | 613K |
| 代理商： | LM3876MWC |
External Components Description (Continued)
(
Figures 1, 2)
Components
Functional Description
10.
R
f2
(Note 15)
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/Rf2Cf)]/[(Rf1 +Rf2)(s + 1/Cf(Rf1 +Rf2))]
11.
C
f
(Note 15)
Compensation capacitor that works with R
f1 and Rf2 to reduce the AC Gain at higher frequencies.
12.
R
M
Mute resistance set up to allow 0.5 mA to be drawn from pin 8 to turn the muting function off.
→R
M is calculated using: RM ≤ (|VEE| 2.6V)/I8 where I8 ≥ 0.5 mA. Refer to the Mute Attenuation vs
Mute Current curves in the Typical Performance Characteristics section.
13.
C
M
Mute capacitance set up to create a large time constant for turn-on and turn-off muting.
14.
R
SN
(Note 15)
Works with C
SN to stabilize the output stage by creating a pole that eliminates high frequency oscillations.
15.
C
SN
(Note 15)
Works with R
SN to stabilize the output stage by creating a pole that eliminates high frequency oscillations.
f
c = 1/(2πRSNCSN)
16.
L
(Note 15)
Provides high impedance at high frequecies so that R may decouple a highly capacitive load
17.
R
(Note 15)
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.
18.
C
S
Provides power supply filtering and bypassing.
19.
S1
Mute switch that mutes the music going into the amplifier when opened.
Note 15: 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, Cf. 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
DS011832-17
SPiKe
Protection Response
DS011832-18
Supply Current vs
Supply Voltage
DS011832-19
LM3876
www.national.com
7
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|---|---|
| LM3876MDC | 56 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC |
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| LM387V | 2 CHANNEL, VIDEO PREAMPLIFIER, PDIP8 |
| LM3886DWF | 68 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3876T | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM3876T | 制造商:National Semiconductor Corporation 功能描述:56W W/Mute, 1 Channel Lm3876T IC Audio Amp |
| LM3876T/NOPB | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM3876TF | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM3876TF NOPB | 制造商:Texas Instruments 功能描述:8MHz Class-AB Bulk |
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