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參數(shù)資料
| 型號： | TPA711DR |
| 元件分類： | 運動控制電子 |
| 英文描述： | Single Audio Amplifier |
| 中文描述： | 單音頻放大器 |
| 文件頁數(shù)： | 25/32頁 |
| 文件大小： | 522K |
| 代理商： | TPA711DR |
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TPA711
700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
SLOS230C
–
NOVEMBER 1998
–
REVISED APRIL 2001
25
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
component selection (continued)
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
than the source dc level. It is important to confirm the capacitor polarity in the application.
power supply decoupling, C
S
The TPA711 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.
midrail bypass capacitor, C
B
The midrail bypass capacitor, C
B
, is the most critical capacitor and serves several important functions. During
start-up or recovery from shutdown mode, C
B
determines the rate at which the amplifier starts up. The second
function is to reduce noise produced by the power supply caused by coupling into the output drive signal. This
noise is from the midrail generation circuit internal to the amplifier, which appears as degraded PSRR
THD + N. The capacitor is fed from a 250-k
source inside the amplifier. To keep the start-up pop as low as
possible, the relationship shown in equation 10 should be maintained. This insures the input capacitor is fully
charged before the bypass capacitor is fully charged and the amplifier starts up.
(10)
10
250 k
CB
1
RF
RI
CI
As an example, consider a circuit where C
B
is 2.2
μ
F, C
I
is 0.47
μ
F, R
F
is 50 k
, and R
I
is 10 k
. Inserting these
values into the equation 10 we get:
18.2
35.5
which satisfies the rule. Bypass capacitor, C
B
, values of 0.1
μ
F to 2.2
μ
F ceramic or tantalum low-ESR
capacitors
are recommended for the best THD and noise performance.
single-ended operation
In SE mode (see Figure 51), the load is driven from the primary amplifier output (V
O
+, terminal 5).
In SE mode the gain is set by the R
F
and R
I
resistors and is shown in equation 11. Since the inverting amplifier
is not used to mirror the voltage swing on the load, the factor of 2, from equation 5, is not included.
(11)
SE Gain
RF
RI
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| TPA711DRG4 | 功能描述:音頻放大器 Mono Class-AB w/Mono Hdphone Drive RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA711EVM | 制造商:TI 制造商全稱:Texas Instruments 功能描述:700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER |
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