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| 型号： | TPA6112A2DGQ |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.15 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO10 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 7/22页 |
| 文件大小： | 701K |
| 代理商： | TPA6112A2DGQ |
www.ti.com
MIDRAIL BYPASS CAPACITOR, C
(B)
1
C
(B)
230 k
v
1
C
i Ri
(6)
1
C
(B)
230 k
v
1
C
i Ri
1
R
LC(C)
(8)
USING LOW-ESR CAPACITORS
OUTPUT COUPLING CAPACITOR, C
(C)
5-V VERSUS 3.3-V OPERATION
fc +
1
2p R
L C(C)
(7)
TPA6112A2
SLOS342A – DECEMBER 2000 – REVISED SEPTEMBER 2004
Table 1. Common Load Impedances vs Low-
Frequency Output Characteristics in SE Mode
The midrail bypass capacitor, C(B), serves several
RL
C(C)
LOWEST FREQUENCY
important functions. During start up, C(B) determines
32
68 F
73 Hz
the rate at which the amplifier starts up. This helps to
push the start-up pop noise into the subaudible range
10,000
68 F
0.23 Hz
(so low it can not be heard). The second function is to
47,000
68 F
0.05 Hz
reduce noise produced by the power supply caused
by coupling into the output drive signal. This noise is
As Table 1 indicates, headphone response is ad-
from the midrail generation circuit internal to the
equate, and drive into line level inputs (a home stereo
amplifier. The capacitor is fed from a 230-k
source
for example) is very good.
inside the amplifier. To keep the start-up pop as low
as possible, maintain the relationship shown in
The
output
coupling
capacitor
required
in
Equation 6.
single-supply SE mode also places additional con-
straints on the selection of other components in the
amplifier circuit. With the rules described earlier still
valid, add the following relationship:
Consider an example circuit where C(B) is 1 F, Ci is
1 F, and Ri is 20 k. Subsitituting these values into
the equation 9 results in: 6.25
≤ 50 which satisfies the
rule. Bypass capacitor, C(B), values of 0.1 F to 1 F
ceramic or tantalum low-ESR capacitors are rec-
ommended for the best THD and noise performance.
Low-ESR capacitors are recommended throughout
this application. A real capacitor can be modeled
simply as a resistor in series with an ideal capacitor.
The voltage drop across this resistor minimizes the
In a typical single-supply, single-ended (SE) configur-
beneficial effects of the capacitor in the circuit. The
ation, an output coupling capacitor (C(C)) is required
lower the equivalent value of this resistance, the
to block the dc bias at the output of the amplifier, thus
more the real capacitor behaves like an ideal capaci-
preventing dc currents in the load. As with the input
tor.
coupling capacitor, the output coupling capacitor and
impedance of the load form a high-pass filter
governed by Equation 7.
The TPA6112A2 was designed for operation over a
supply range of 2.5 V to 5.5 V. This data sheet
provides full specifications for 5-V and 3.3-V oper-
ation, since these are considered to be the two most
The main disadvantage, from a performance stand-
common supply voltages. There are no special con-
point, is that the typically-small load impedance drives
siderations for 3.3-V versus 5-V operation as far as
the low-frequency corner higher. Large values of C(C)
supply bypassing, gain setting, or stability. The most
are required to pass low frequencies into the load.
important consideration is that of output power. Each
Consider the example where a C(C) of 68 F is
amplifier in theTPA6112A2 can produce a maximum
chosen and loads vary from 32
to 47 k. Table 1
voltage swing of VDD– 1 V. This means, for 3.3-V
summarizes the frequency response characteristics
operation, clipping starts to occur when VO(PP) = 2.3 V
of each configuration.
as opposed when VO(PP) = 4 V while operating at 5 V.
The reduced voltage swing subsequently reduces
maximum output power into the load before distortion
becomes significant.
15
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