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LM4995 Datasheet(PDF) 11 Page - Texas Instruments

No. de pieza LM4995
Descripción Electrónicos  1.3 W Audio Power Amplifier
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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LM4995 Datasheet(HTML) 11 Page - Texas Instruments

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SHUTDOWN VOLTAGE (V)
0
100
10
20
30
40
50
60
70
80
90
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
VOLTAGE SUPPLY (V)
2.0
3.0
4.0
5.0
6.0
0
200
400
600
800
1000
1200
1400
1600
1800
2000
THD+N = 10%
THD+N = 1%
LM4995, LM4995TMBD
www.ti.com
SNAS329F – APRIL 2006 – REVISED NOVEMBER 2009
Typical Performance Characteristics (continued)
Output Power
vs
Shutdown Voltage VSDIL
Supply Voltage
VDD = 5V
RL = 8Ω
Application Information
BRIDGE CONFIGURATION EXPLANATION
As shown in Figure 1, the LM4995 has two internal operational amplifiers. The first amplifier's gain is externally
configurable, while the second amplifier is internally fixed in a unity-gain, inverting configuration. The closed-loop
gain of the first amplifier is set by selecting the ratio of Rf to Ri while the second amplifier's gain is fixed by the
two internal 20k
Ω resistors. Figure 1 shows that the output of amplifier one serves as the input to amplifier two
which results in both amplifiers producing signals identical in magnitude, but out of phase by 180°. Consequently,
the differential gain for the IC is
AVD= 2 *(Rf/Ri)
(1)
By driving the load differentially through outputs Vo1 and Vo2, an amplifier configuration commonly referred to as
“bridged mode” is established. Bridged mode operation is different from the classical single-ended amplifier
configuration where one side of the load is connected to ground.
A bridge amplifier design has a few distinct advantages over the single-ended configuration, as it provides
differential drive to the load, thus doubling output swing for a specified supply voltage. Four times the output
power is possible as compared to a single-ended amplifier under the same conditions. This increase in attainable
output power assumes that the amplifier is not current limited or clipped. In order to choose an amplifier's closed-
loop gain without causing excessive clipping, please refer to the Audio Power Amplifier Design section.
A bridge configuration, such as the one used in LM4995, also creates a second advantage over single-ended
amplifiers. Since the differential outputs, Vo1 and Vo2, are biased at half-supply, no net DC voltage exists across
the load. This eliminates the need for an output coupling capacitor which is required in a single supply, single-
ended amplifier configuration. Without an output coupling capacitor, the half-supply bias across the load would
result in both increased internal IC power dissipation and also possible loudspeaker damage.
POWER DISSIPATION
Power dissipation is a major concern when designing a successful amplifier, whether the amplifier is bridged or
single-ended. A direct consequence of the increased power delivered to the load by a bridge amplifier is an
increase in internal power dissipation. Since the LM4995 has two operational amplifiers in one package, the
maximum internal power dissipation is 4 times that of a single-ended amplifier. The maximum power dissipation
for a given application can be derived from the power dissipation graphs or from Equation 1.
PDMAX = 4*(VDD)
2/(2π2R
L)
(2)
Copyright © 2006–2009, Texas Instruments Incorporated
Submit Documentation Feedback
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Product Folder Links: LM4995 LM4995TMBD


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