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LM4991LD Datenblatt(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teilenummer LM4991LD
Bauteilbeschribung  3W Audio Power Amplifier with Shutdown Mode
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4991LD Datenblatt(HTML) 5 Page - National Semiconductor (TI)

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External Components Description
(Figure 1)
Components
Functional Description
1.
R
i
Inverting input resistance that sets the closed-loop gain in conjunction with R
f. This resistor also forms a high
pass filter with C
i at fC= 1/(2
π R
iCi).
2.
C
i
Input coupling capacitor that blocks the DC voltage at the amplifiers input terminals. Also creates a highpass
filter with R
i at fc = 1/(2
π R
iCi). Refer to the section, Proper Selection of External Components, for an
explanation of how to determine the value of C
i.
3.
R
f
Feedback resistance that sets the closed-loop gain in conjunction with R
i.
4.
C
S
Supply bypass capacitor that provides power supply filtering. Refer to the Power Supply Bypassing section
for information concerning proper placement and selection of the supply bypass capacitor.
5.
C
B
Bypass pin capacitor that provides half-supply filtering. Refer to the section, Proper Selection of External
Components, for information concerning proper placement and selection of C
B.
Typical Performance Characteristics
LD and MH Specific Characteristics
THD+N vs Frequency
V
DD = 5V, RL =4
Ω, and P
O =1W
THD+N vs Output Power
V
DD = 5V, RL =4
Ω,andf=1kHz
20074041
20074042
Typical Performance Characteristics
THD+N vs Frequency
V
DD = 5V, RL =8
Ω, and P
O = 500mW
THD+N vs Frequency
V
DD = 3V, RL =4
Ω, and P
O = 500mW
20074043
20074044
www.national.com
5


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