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LM4734 Datasheet(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4734
Description  3 Channel 20W Audio Power Amplifier with Mute and Standby
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4734 Datasheet(HTML) 8 Page - National Semiconductor (TI)

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External Components Description
(Figures 1-5)
Components
Functional Description
1R
B
Prevents current from entering the amplifier’s non-inverting input. This current may pass through to the load
during system power down, because of the amplifier’s low input impedance when the undervoltage circuitry
is off. This phenomenon occurs when the V
+ and V- supply voltages are below 1.5V.
2R
i
Inverting input resistance. Along with R
f, sets AC gain.
3R
f
Feedback resistance. Along with R
i, sets AC gain.
4R
f2
(Note 14)
Feedback resistance. Works with Cf and Rf creating a lowpass filter that lowers AC gain at high
frequencies. The -3dB point of the pole occurs when: (R
f -Ri)/2=Rf // [1/(2
πf
cCf)+Rf2] for the
Non-Inverting configuration shown in Figure 5.
5C
f
(Note 14)
Compensation capacitor. Works with R
f and Rf2 to reduce AC gain at higher frequencies.
6C
C
(Note 14)
Compensation capacitor. Reduces the gain at higher frequencies to avoid quasi-saturation oscillations of the
output transistor. Also suppresses external electromagnetic switching noise created from fluorescent lamps.
7C
i
(Note 14)
Feedback capacitor which ensures unity gain at DC. Along with R
i also creates a highpass filter at fc =
1/(2
πR
iCi).
8C
S
Provides power supply filtering and bypassing. Refer to the Supply Bypassing application section for proper
placement and selection of bypass capacitors.
9R
V
(Note 14)
Acts as a volume control by setting the input voltage level.
10
R
IN
(Note 14)
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
INCIN). If the value of RIN is too large, oscillations may be observed on
the outputs when the inputs are floating. Recommended values are 10k
Ω to 47kΩ. Refer to Figure 5.
11
C
IN
(Note 14)
Input capacitor. Prevents the input signal’s DC offsets from being passed onto the amplifier’s inputs.
12
R
SN
(Note 14)
Works with C
SN to stabilize the output stage by creating a pole that reduces high frequency instabilities.
13
C
SN
(Note 14)
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
SNCSN). Refer to Figure 5.
14
L (Note 14)
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 5.
15
R (Note 14)
16
R
A
Provides DC voltage biasing for the transistor Q1 in single supply operation.
17
C
A
Provides bias filtering for single supply operation.
18
R
INP
(Note 14)
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.
19
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.
20
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.
21
R
M
Limits the current drawn into the logic gates for the MUTE and STANDBY pins.
22
S
1
Standby switch. When switched to GND, the amplifier will be in PLAY mode.
23
S
2
Mute switch. When switched to GND, the amplifier will be in PLAY mode.
24
R
OUT
Reduces current flow between outputs that are caused by Gain or DC offset differences between the
amplifiers.
Note 14: Optional components dependent upon specific design requirements.
www.national.com
8


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