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參數(shù)資料
| 型號(hào)： | TPA6111A2DR |
| 元件分類： | 音頻放大器 |
| 英文描述： | Rotary Keylock Switch; Key Removal Position:1, 2; Circuitry:SPST; Indexing:90; Contact Current Max:4A; Contact Rating:4A; Leaded Process Compatible:Yes; Mounting Type:Solder Lug; No. of Switch Positions:2; Number of Positions:2 |
| 中文描述： | 音頻放大器|雙|的CMOS |?？苵 8引腳|塑料 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 143K |
| 代理商： | TPA6111A2DR |
TPA6100A2
50-mW ULTRALOW VOLTAGE STEREO HEADPHONE
AUDIO POWER AMPLIFIER
SLOS269A
–
JUNE 2000
–
REVISED NOVEMBER 2000
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
input capacitor, C
I
(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 (>10). 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
/4, 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 TPA6100A2 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling
to ensure that 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 power amplifier is recommended.
midrail bypass capacitor, C
B
The midrail bypass capacitor (C
B
) serves several important functions. During startup, C
B
determines the rate
at which the amplifier starts up. This helps to push the start-up pop noise into the subaudible range (so low it
can not be heard). 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. The capacitor
is fed from a 55-k
source inside the amplifier. To keep the start-up pop as low as possible, the relationship
shown in equation 6 should be maintained.
(6)
1
C
B
55 k
1
C
I
R
I
As an example, consider a circuit where C
B
is 1
μ
F, C
I
is 1
μ
F, and R
I
is 20 k
. Inserting these values into the
equation 6 results in: 18.18
≤
50 which satisfies the rule. Bypass capacitor (C
B
) values of 0.47-
μ
F to 1-
μ
F
ceramic or tantalum low-ESR capacitors are recommended for the best THD and noise performance.
output coupling capacitor, C
C
In the typical single-supply single-ended (SE) configuration, an output coupling capacitor (C
C
) is required to
block the dc bias at the output of the amplifier, thus preventing 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 7.
(7)
f
c
1
2 R
L
C
C
The main disadvantage, from a performance standpoint, is that the typically small load impedances drive the
low-frequency corner higher. Large values of C
C
are required to pass low frequencies into the load. Consider
the example where a C
C
of 68
μ
F is chosen and loads vary from 32
to 47 k
. Table 1 summarizes the
frequency response characteristics of each configuration.
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| TPA6111A2DRG4 | 功能描述:音頻放大器 Stereo Headphone Pin Compat 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA6111A2EVM | 功能描述:音頻 IC 開發(fā)工具 TPA6111A2 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA6112A2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:150-mW STEREO AUDIO POWER AMPLIFIER |
| TPA6112A2_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:150-mW STEREO AUDIO POWER AMPLIFIER |
| TPA6112A2DGQ | 功能描述:音頻放大器 Stereo Diff Input Stereo Headphone 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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