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TPA3120D2PWPR データシート(PDF) 11 Page - Texas Instruments

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部品番号 TPA3120D2PWPR
部品情報  25-W STEREO CLASS-D AUDIO POWER AMPLIFIER
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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TPA3120D2PWPR データシート(HTML) 11 Page - Texas Instruments

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INPUT CAPACITOR, C
I
f
=
c
1
2
Z C
p
i
i
-3dB
fc
(2)
C =
i
1
2
Z f
p
i
c
(3)
Single Ended Output Capacitor, C
o
TPA3120D2
SLOS507 – MARCH 2007
In the typical application, an input capacitor (CI) is required to allow the amplifier to bias the input signal to the
proper dc level for optimum operation. In this case, CI and the input impedance of the amplifier (ZI) form a
high-pass filter with the corner frequency determined in Equation 2.
The value of CI is important, as it directly affects the bass (low-frequency) performance of the circuit. Consider
the example where ZI is 20 kΩ and the specification calls for a flat bass response down to 20 Hz. Equation 2 is
reconfigured as Equation 3.
In this example, CI is 0.4 µF; so, one would likely choose a value of 0.47 µF as this value is commonly used. If
the gain is known and is constant, use ZI from Table 1 to calculate CI. A further consideration for this capacitor is
the leakage path from the input source through the input network (CI) 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.
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
πC
oZL
Table 2 shows some common component values and the associated cutoff frequencies:
Table 2. Common Filter Responses
CSE - DC Blocking Capacitor (µF)
Speaker Impedance (
Ω)
fc = 60 Hz (-3 dB)
fc = 40 Hz(-3 dB)
fc = 20 Hz(-3 dB)
4
680
1000
2200
8
330
470
1000
11
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