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參數(shù)資料
| 型號： | LM2876MWC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 40 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC7 |
| 封裝： | WAFER |
| 文件頁數(shù)： | 19/22頁 |
| 文件大?。?/td> | 611K |
| 代理商： | LM2876MWC |
Equivalent Schematic (excluding active protection circuitry)
External Components Description
(
Figures 1, 2)
Components
Functional Description
1.
R
IN
Acts as a volume control by setting the voltage level allowed to the amplifier’s input terminals.
2.
R
A
Provides DC voltage biasing for the single supply operation and bias current for the positive input terminal.
3.
C
A
Provides bias filtering.
4.
C
Provides AC coupling at the input and output of the amplifier for single supply operation.
5.
R
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 under-voltage
circuitry is off. This phenomenon occurs when the supply voltages are below 1.5V.
6.
C
(Note 15)
Reduces the gain (bandwidth of the amplifier) at high frequencies to avoid quasi-saturation oscillations of
the output transistor. The capacitor also suppresses external electromagnetic switching noise created from
fluorescent lamps.
7.
Ri
Inverting input resistance to provide AC Gain in conjunction with R
f1.
8.
Ci
(Note 15)
Feedback capacitor. Ensures unity gain at DC. Also a low frequency pole (highpass roll-off) at:
f
c = 1/(2πRi Ci)
9.
R
f1
Feedback resistance to provide AC Gain in conjunction with Ri.
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.
DS011775-6
LM2876
www.national.com
6
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| LM2876T/NOPB | 功能描述:IC AMP AUDIO PWR 40W AB TO220-11 RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Overture™ 產品培訓模塊: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) |
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| LM2876TF NOPB | 制造商:Texas Instruments 功能描述:Audio Amp Speaker 1-CH Mono 40W Class-AB 11-Pin(11+Tab) TO-220 Rail |
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