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参数资料
| 型号： | LM4731TA/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| 封装： | PLASTIC, TO-220, 15 PIN |
| 文件页数： | 13/16页 |
| 文件大小： | 640K |
| 代理商： | LM4731TA/NOPB |
External Components Description
( See Figures1-4)
Components
Functional 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.
3R
f
Feedback resistance to provide AC gain in conjunction with R
i.
4C
i
Feedback capacitor which ensures unity gain at DC. Also creates a highpass filter with R
i at fC = 1/(2
πR
iCi).
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.
10
C
SN
Works with R
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
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 13: Optional components dependent upon specific design requirements.
LM4731
www.national.com
6
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