参数资料
型号: TPA321DGNRG4
厂商: TEXAS INSTRUMENTS INC
元件分类: 音频/视频放大
英文描述: 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
封装: GREEN, PLASTIC, MSOP-8
文件页数: 7/29页
文件大小: 773K
代理商: TPA321DGNRG4
www.ti.com
I
DD RMS +
2V
P
p
R
L
P
SUP + VDD IDD 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
2V
DD
+
p
P
LRL
2
1 2
2V
DD
(4)
TPA321
SLOS312C – JUNE 2000 – 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-
BTL Systems
PEAK-to-PEAK
INTERNAL
OUTPUT POWER
EFFICIENCY
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. Note that in Equation 4, VDD is in the denominator. This
indicates that as VDD goes down, efficiency goes up.
15
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