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參數(shù)資料
| 型號： | LM3875T/NOPB |
| 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, PZFM11 |
| 封裝： | LEAD FREE, PLASTIC, TO-220, 11 PIN |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 1006K |
| 代理商： | LM3875T/NOPB |
External Components Description
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
C
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
Feedback capacitor. Ensures unity gain at DC. Also a low frequency pole (highpass roll-off) at:
f
c = 1/(2
π 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/(2
πR
SN 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 eliminate unwanted high frequency oscillations they may
cause certain undesirable effects when they interact. Inter-
action 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 compo-
nent functionality when designing in these components.
The optional external components shown in Figure 2 and
described above are applicable in both single and split volt-
age supply configurations.
LM3875
www.national.com
6
相關(guān)PDF資料 |
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| LM399AH-20#TRPBF | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 6.95 V, MBCY4 |
| LM399AH-50#TR | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 6.95 V, MBCY4 |
| LM199AH#PBF | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 6.95 V, MBCY4 |
| LM399AH-50#PBF | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 6.95 V, MBCY4 |
| LM199AH-20#PBF | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 6.95 V, MBCY4 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3876 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Audio Power Amplifier Series High-Performance 56W Audio Power Amplifier w/Mute |
| LM3876_00 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Audio Power Amplifier Series High-Performance 56W Audio Power Amplifier w/Mute |
| LM3876CCT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single Audio Amplifier |
| 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 |
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