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參數(shù)資料
| 型號(hào)： | TPA2000D4GQC |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA32 |
| 封裝： | PLASTIC, BGA-32 |
| 文件頁數(shù)： | 13/27頁 |
| 文件大?。?/td> | 456K |
| 代理商： | TPA2000D4GQC |
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TPA2000D4
STEREO 2-W CLASS-D AUDIO POWER AMPLIFIER
WITH STEREO HP AMPLIFIER
SLOS337 – DECEMBER 2000
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
input capacitor, CI
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 5.
f
c(highpass) +
1
2
pZ
I
C
I
–3 dB
fc
(5)
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 k and the specification calls for a flat bass response down to 80 Hz. Equation 5
is reconfigured as equation 6.
C
I +
1
2
pZ
I fc
(6)
In this example, CI is 0.1 F so one would likely choose a value in the range of 0.1 F to 1 F. If the gain is known
and will be 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 VDD/2, which is likely higher than the source dc level. Note that it
is important to confirm the capacitor polarity in the application.
CI must be 10 times smaller than the bypass capacitor to reduce clicking and popping noise from power on/off
and entering and leaving shutdown. After sizing CI for a given cut-off frequency, size the bypass capacitor to
10 times that of the input capacitor.
(7)
CI ≤ CBYP / 10
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