APA2069 查看數據表（PDF） - Anpec Electronics
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APA2069 Datasheet PDF : 26 Pages
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APA2069
Typical Characteristics (Cont.)
Power Dissipation vs. Output Power
200
180
160
140
120
100
80
60
40
20
0
0
RL=8Ω
RL=16Ω
RL=32Ω
VDD=5V
THD<1%
SE
50
100
150
200
250
Output Power(W)
Application Descriptions
BTL Operation
The APA2069 output stage (power amplifier) has two
pairs of operational amplifiers internally, allowed for
different amplifier configurations.
OUT+
Volume Control
amplifier output
signal
OP1
RL
OUT-
Vbias
OP2
Circuit
Figure 1: APA2069 internal configuration
(each channel)
The power amplifier’s OP1 gain is setting by internal
unity-gain and input audio signal is come from internal
volume control amplifier, while the second amplifier OP2
is internally fixed in a unity-gain, inverting configuration.
Figure 1 shows that the output of OP1 is connected
to the input to OP2, which results in the output signals
of with both amplifiers with identical in magnitude, but
out of phase 180°. Consequently, the differential gain
for each channel is 2 x (Gain of SE mode).
By driving the load differentially through outputs OUT+
and OUT-, an amplifier configuration commonly referred
to as bridged mode is established. BTL mode operation
is different from the classical single-ended SE amplifier
configuration where one side of its load is connected
to ground.
A BTL amplifier design has a few distinct advantages
Copyright © ANPEC Electronics Corp.
17
Rev. A.1 - Aug., 2005
www.anpec.com.tw
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