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LM4700 Fiches technique(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM4700
Description  Overture??Audio Power Amplifier Series 30W Audio Power Amplifier with Mute and Standby Modes
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4700 Fiches technique(HTML) 7 Page - National Semiconductor (TI)

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External Components Description
Components
Functonal 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. Also creates a highpass filter with CI
at f
C = 1/(2πRICI).
3R
F
Feedback resistance to provide AC gain in conjunction with R
I.
4C
I (Note 15)
Feedback capacitor which ensures unity gain at DC.
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
(Note 15)
Acts as a volume control by setting the input voltage level.
7R
IN
(Note 15)
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/(2πRINCIN). Refer to Figure 4.
8C
IN
(Note 15)
Input capacitor which blocks the input signal’s DC offsets from being passed onto the amplifier’s inputs.
9R
SN
(Note 15)
Works with C
SN to stabilize the output stage by creating a pole that reduces high frequency instabilities.
The pole is set at f
C = 1/(2πRSNCSN). Refer to Figure 4.
10
C
SN
(Note 15)
Works with R
SN to stabilize the output stage by creating a pole that reduces high frequency instabilities.
11
L (Note 15)
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
R (Note 15)
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
(Note 15)
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 15: Optional components dependent upon specific design requirements.
www.national.com
7


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