LM4991LDX/NOPB National Semiconductor, LM4991LDX/NOPB Datasheet - Page 5

• Manufacturer Part Number: LM4991LDX/NOPB
• Description: IC AMP AUDIO PWR 3W MONO AB 8LLP
• Manufacturer: National Semiconductor
• Series: Boomer®r
• Type: Class ABr

Specifications of LM4991LDX/NOPB

• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 3W x 1 @ 3 Ohm
• Voltage - Supply: 2.2 V ~ 5.5 V
• Features: Depop, Shutdown, Thermal Protection
• Mounting Type: Surface Mount
• Package / Case: 8-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM4991LDX

External Components Description
Typical Performance Characteristics
LD and MH Specific Characteristics
Typical Performance Characteristics
Components
(Figure 1)
1.
2.
3.
4.
5.
C
C
R
C
R
V
S
B
i
i
f
DD
V
DD
= 5V, R
Inverting input resistance that sets the closed-loop gain in conjunction with R
pass filter with C
Input coupling capacitor that blocks the DC voltage at the amplifiers input terminals. Also creates a highpass
filter with R
explanation of how to determine the value of C
Feedback resistance that sets the closed-loop gain in conjunction with R
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.
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
= 5V, R
THD+N vs Frequency
THD+N vs Frequency
L
= 8Ω, and P
L
= 4Ω, and P
i
at f
c
i
= 1/(2π R
at f
O
C
= 500mW
= 1/(2π R
O
= 1W
i
C
i
). Refer to the section, Proper Selection of External Components, for an
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i
C
i
).
Functional Description
5
i
.
V
DD
V
DD
= 3V, R
THD+N vs Output Power
= 5V, R
THD+N vs Frequency
L
i
= 4Ω, and P
L
.
= 4Ω, and f = 1 kHz
f
. This resistor also forms a high
B
.
O
= 500mW
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