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參數資料
| 型號： | TPA301DG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數： | 8/28頁 |
| 文件大?。?/td> | 765K |
| 代理商： | TPA301DG4 |
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Audio
Input
Bias
Control
VDD
350 mW
6
5
7
VO+
VDD
1
2
4
BYPASS
IN -
VDD/2
CS
1
F
CB
2.2
F
SHUTDOWN
VO-
8
GND
From System Control
3
IN+
-
+
-
+
CI
0.47
F
RI
10 k
RF
50 k
CF
5 pF
COMPONENT SELECTION
Gain Setting Resistors, RF and RI
BTL Gain + AV + * 2
R
F
R
I
(5)
Effective Impedance +
R
F
R
I
R
F )
R
I
(6)
TPA301
SLOS208E – JANUARY 1998 – REVISED JUNE 2004
Figure 26. TPA301 Application Circuit
The following sections discuss the selection of the components used in Figure 26.
The gain for each audio input of the TPA301 is set by resistors RF and RI according to Equation 5 for BTL mode.
BTL mode operation brings about the factor 2 in the gain equation due to the inverting amplifier mirroring the
voltage swing across the load. Given that the TPA301 is a MOS amplifier, the input impedance is high;
consequently, input leakage currents are not generally a concern, although noise in the circuit increases as the
value of RF increases. In addition, a certain range of RF values are required for proper start-up operation of the
amplifier. Taken together it is recommended that the effective impedance seen by the inverting node of the
amplifier be set between 5 k
and 20 k. The effective impedance is calculated in Equation 6.
As an example, consider an input resistance of 10 k
and a feedback resistor of 50 k. The BTL gain of the
amplifier would be -10 V/V, and the effective impedance at the inverting terminal would be 8.3 k
, which is well
within the recommended range.
For high-performance applications, metal film resistors are recommended because they tend to have lower noise
levels than carbon resistors. For values of RF above 50 k, the amplifier tends to become unstable due to a pole
formed from RF and the inherent input capacitance of the MOS input structure. For this reason, a small
compensation capacitor, CF, of approximately 5 pF should be placed in parallel with RF when RF is greater than
50 k
. This, in effect, creates a low-pass filter network with the cutoff frequency defined in Equation 7.
16
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA301DGH | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TPA301DGN | 功能描述:音頻放大器 0.35W Mono RoHS:否 制造商:STMicroelectronics 產品: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 |
| TPA301DGNG4 | 功能描述:音頻放大器 0.35-W Mono Audio Power Amplifier RoHS:否 制造商:STMicroelectronics 產品: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 |
| TPA301DGNR | 功能描述:音頻放大器 0.35-W Mono Audio Power Amplifier RoHS:否 制造商:STMicroelectronics 產品: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 |
| TPA301DGNRG4 | 功能描述:音頻放大器 0.35-W Mono Audio Power Amplifier RoHS:否 制造商:STMicroelectronics 產品: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 |
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