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參數(shù)資料
| 型號(hào)： | TPA3120D2_07 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 25-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 25 W立體聲D類音頻功率放大器 |
| 文件頁數(shù)： | 14/27頁 |
| 文件大?。?/td> | 631K |
| 代理商： | TPA3120D2_07 |
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INPUT CAPACITOR, C
I
In the typical application, an input capacitor (C
) is required to allow the amplifier to bias the input signal to the
proper dc level for optimum operation. In this case, C
I
and the input impedance of the amplifier (Z
I
) form a
high-pass filter with the corner frequency determined in
Equation 2
.
f
=
c
1
2 Z C
p
i
-3 dB
f
c
(2)
C =
1
2 Z f
p
i c
(3)
Single Ended Output Capacitor, C
O
In single ended (SE) applications, the DC blocking capacitor forms a high pass filter with speaker impedance.
The frequency response rolls of with decreasing frequency at a rate of 20 dB/decade. The cutoff frequency is
determined by
fc = 1/2
π
C
O
Z
L
Table 2
shows some common component values and the associated cutoff frequencies:
TPA3120D2
SLOS507C–MARCH 2007–REVISED MAY 2007
The value of C
I
is important, as it directly affects the bass (low-frequency) performance of the circuit. Consider
the example where Z
I
is 20 k
and the specification calls for a flat bass response down to 20 Hz.
Equation 2
is
reconfigured as
Equation 3
.
In this example, C
I
is 0.4 μF; so, one would likely choose a value of 0.47
μ
F as this value is commonly used. If
the gain is known and is constant, use Z
from
Table 1
to calculate C
. A further consideration for this capacitor is
the leakage path from the input source through the input network (C
I
) and the feedback network to the load. This
leakage current creates a dc offset voltage at the input to the amplifier that reduces useful headroom, especially
in high gain applications. For this reason, a low-leakage tantalum or ceramic capacitor is the best choice. When
polarized capacitors are used, the positive side of the capacitor should face the amplifier input in most
applications as the dc level there is held at 2 V, which is likely higher than the source dc level. Note that it is
important to confirm the capacitor polarity in the application. Additionally, lead-free solder can create dc offset
voltages and it is important to ensure that boards are cleaned properly.
Table 2. Common Filter Responses
C
SE
- DC Blocking Capacitor (
μ
F)
f
c
= 60 Hz (-3 dB)
680
330
Speaker Impedance (
)
f
c
= 40 Hz(-3 dB)
1000
470
f
c
= 20 Hz(-3 dB)
2200
1000
4
8
14
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