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參數資料
| 型號： | TPA4860DG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| 封裝： | GREEN, PLASTIC, MS-012AC, SOIC-16 |
| 文件頁數： | 9/27頁 |
| 文件大?。?/td> | 632K |
| 代理商： | TPA4860DG4 |
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SELECTION OF COMPONENTS
Audio
Input
Bias
Control
VDD = 5 V
1-W
Internal
Speaker
12
10
15
1, 4, 8, 9, 16
VO1
VO2
VDD
2
3
7
6
5
14
13
11
GAIN
IN +
IN
BYPASS
HP-IN1
HP-IN2
HP-SENSE
SHUTDOWN
VDD/2
CI
RI
RF
VDD
RPU
Headphone
Plug
NC
CF
50 k
50 k
46 k
46 k
CB
CS
Gain Setting Resistors, RF and RI
Gain + * 2
R
F
R
I
(5)
Effective Impedance +
R
FRI
R
F ) RI
(6)
TPA4860
SLOS164B – SEPTEMBER 1996 – REVISED JUNE 2004
Figure 37 is a schematic diagram of a typical notebook computer application circuit.
Figure 37. TPA4860 Typical Notebook Computer Application Circuit
The gain for the TPA4860 is set by resistors RF and RI according to Equation 5.
BTL mode operation brings about the factor of 2 in the gain equation due to the inverting amplifier mirroring the
voltage swing across the load. Given that the TPA4860 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 is 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 gain of the amplifier
would be –10 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 of approximately 5 pF should be placed in parallel with RF. In effect, this creates a
low-pass filter network with the cutoff frequency defined in Equation 7.
17
相關PDF資料 |
PDF描述 |
|---|---|
| TPA4860DRG4 | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| TPA4860Y | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC16 |
| TPA4861DR | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TPA4861D | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| TPA4861DG4 | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA4860DR | 功能描述:音頻放大器 1-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 |
| TPA4860DRG4 | 功能描述:音頻放大器 1-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 |
| TPA4860EVM | 功能描述:音頻 IC 開發(fā)工具 TPA4860 Eval Mod RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA4861 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W MONO AUDIO POWER AMPLIFIER |
| TPA4861_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W MONO AUDIO POWER AMPLIFIER |
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