參數(shù)資料
型號(hào)： TPA0252PWP
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻控制
英文描述： 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
封裝： GREEN, PLASTIC, HTSSOP-24
文件頁(yè)數(shù)： 11/34頁(yè)
文件大小： 851K
代理商： TPA0252PWP
www.ti.com
POWER SUPPLY DECOUPLING, C
(S)
MIDRAIL BYPASS CAPACITOR, C
(BYP)
OUTPUT COUPLING CAPACITOR, C
(C)
f
c(high) +
1
2 p R
L
C
(C)
3 dB
fc
(5)
TPA0252
SLOS288B – JUNE 2000 – REVISED SEPTEMBER 2004
This high-performance CMOS audio amplifier requires adequate power-supply decoupling to minimize output
total harmonic distortion (THD). Power-supply decoupling also prevents oscillations with long lead lengths
between the amplifier and the speaker. Optimum decoupling is achieved by using two capacitors of different
types that target different types of noise on the power-supply leads. To filter high-frequency transients, spikes, or
digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 0.1 F, placed
as close as possible to the device VDD lead, works best. For filtering low-frequency noise signals, an aluminum
electrolytic capacitor of 10 F or greater placed near the audio power amplifier is recommended.
The midrail bypass capacitor, C(BYP), is the most critical capacitor and serves several important functions. During
startup or recovery from shutdown mode, C(BYP) determines the rate at which the amplifier starts up. The second
function is to reduce power-supply noise coupling into the output drive signal. This noise is from the midrail
generation circuit internal to the amplifier, and appears as degraded PSRR and THD+N.
Bypass capacitor (C(BYP)) values of 0.47-F to 1-F, and ceramic or tantalum low-ESR capacitors are
recommended for best THD and noise performance.
In a typical single-supply SE configuration, an output coupling capacitor (C(C)) is required to block the dc bias at
the output of the amplifier to prevent dc currents in the load. As with the input coupling capacitor, the output
coupling capacitor and impedance of the load form a high-pass filter governed by Equation 5.
The main disadvantage, from a performance standpoint, is that load impedances are typically small, driving the
low-frequency corner higher, degrading the bass response. Large values of C(C) are required to pass low
frequencies into the load. Consider the example where a C(C) of 330 F is chosen and loads include 3 , 4 , 8
, 32 , 10 k, and 47 k. Table 1 summarizes the frequency response characteristics of each configuration.
Table 1. Common Load Impedances Vs Low Frequency
Output Characteristics in SE Mode
RL
C(C)
LOWEST FREQUENCY
3
330 F
161 Hz
4
330 F
120 Hz
8
330 F
60 Hz
32
330 F
15 Hz
10,000
330 F
0.05 Hz
47,000
330 F
0.01 Hz
19
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