參數(shù)資料
型號(hào)： TPA0211DGNR
元件分類： 音頻放大器
英文描述： AUDIO AMPLIFIER|SINGLE|CMOS|TSSOP|8PIN|PLASTIC
中文描述： 音頻放大器|單|的CMOS | TSSOP封裝| 8引腳|塑料
文件頁(yè)數(shù)： 30/42頁(yè)
文件大?。?/td> 806K
代理商： TPA0211DGNR
TPA0202
2-W STEREO AUDIO POWER AMPLIFIER
SLOS205B – FEBRUARY 1998 – REVISED DECEMBER 2000
30
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
input capacitor, C
I
In the typical application an input capacitor, C
I
, 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 R
I
form a high-pass filter with the corner frequency
determined in equation 8.
(8)
–3 dB
fc
f
c(highpass)
1
2 R
I
C
I
The value of C
I
is important to consider as it directly affects the bass (low frequency) performance of the circuit.
Consider the example where R
I
is 10 k
and the specification calls for a flat bass response down to 40 Hz.
Equation 8 is reconfigured as equation 9.
(9)
C
I
1
2 R
I
f
c
In this example, C
I
is 0.40
μ
F so one would likely choose a value in the range of 0.47
μ
F to 1
μ
F. A further
consideration for this capacitor is the leakage path from the input source through the input network (R
I
, C
I
) and
the feedback resistor (R
F
) 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 V
DD
/2, which is likely higher
that the source dc level. Please note that it is important to confirm the capacitor polarity in the application.
power supply decoupling, C
S
The TPA0202 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling
to ensure the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also
prevents oscillations for long lead lengths between the amplifier and the speaker. The optimum decoupling is
achieved by using two capacitors of different types that target different types of noise on the power supply leads.
For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance
(ESR) ceramic capacitor, typically 0.1
μ
F placed as close as possible to the device V
DD
lead works best. For
filtering lower-frequency noise signals, a larger aluminum electrolytic capacitor of 10
μ
F or greater placed near
the audio power amplifier is recommended.
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