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TPA721 Datasheet(PDF) 14 Page - Texas Instruments

Part No. TPA721
Description  700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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TPA721 Datasheet(HTML) 14 Page - Texas Instruments

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I
DD(RMS) +
2V
P
p
R
L
P
SUP + VDD
I
DD(RMS) +
V
DD 2VP
p
R
L
Efficiency +
P
L
P
SUP
where
P
L +
V
L(RMS)
2
R
L
+
Vp
2
2R
L
V
L(RMS) +
V
P
2
(3)
Efficiency of a BTL configuration
+
p
V
P
4V
DD
+
p
2 P
LRL
1 2
4V
DD
(4)
TPA721
SLOS231E – NOVEMBER 1998 – REVISED JUNE 2004
APPLICATION INFORMATION (continued)
Table 1 employs Equation 4 to calculate efficiencies for three different output power levels. The efficiency of the
amplifier is quite low for lower power levels and rises sharply as power to the load is increased, resulting in a
nearly flat internal power dissipation over the normal operating range. The internal dissipation at full output power
is less than in the half power range. Calculating the efficiency for a specific system is the key to proper power
supply design.
Table 1. Efficiency vs Output Power in 3.3-V, 8-
Ω BTL Systems
INTERNAL
OUTPUT POWER
EFFICIENCY
PEAK VOLTAGE
DISSIPATION
(W)
(%)
(V)
(W)
0.125
33.6
1.41
0.26
0.25
47.6
2.00
0.29
0.375
58.3
2.45(1)
0.28
(1)
High-peak voltage values cause the THD to increase.
A final point to remember about linear amplifiers (either SE or BTL) is how to manipulate the terms in the
efficiency equation to utmost advantage when possible. In Equation 4, VDD is in the denominator. This indicates
that as VDD goes down, efficiency goes up.
14


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