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參數資料
| 型號： | TPA701DRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.35 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數： | 7/28頁 |
| 文件大小： | 790K |
| 代理商： | TPA701DRG4 |
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TPA701
700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
SLOS229D – NOVEMBER1998 – REVISED MAY 2003
15
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
application schematic
Figure 26 is a schematic diagram of a typical handheld audio application circuit, configured for a gain of
–10 V/V.
Audio
Input
Bias
Control
VDD
700 mW
6
5
7
VO+
VDD
1
2
4
BYPASS
IN –
VDD/2
CI
RI
10 k
CS
1
F
CB
2.2
F
SHUTDOWN
VO– 8
GND
From System Control
3
IN+
RF
50 k
–
+
–
+
Figure 26. TPA701 Application Circuit
The following sections discuss the selection of the components used in Figure 26.
component selection
gain setting resistors, RF and RI
The gain for each audio input of the TPA701 is set by resistors RF and RI according to equation 5 for BTL mode.
(5)
BTL gain
+* 2
R
F
R
I
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 TPA701 is a MOS amplifier, the input impedance is very 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.
(6)
Effective impedance
+
R
F
R
I
R
F )
R
I
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相關代理商/技術參數 |
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|---|---|
| TPA701EVM | 制造商:TI 制造商全稱:Texas Instruments 功能描述:700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER |
| TPA701MSOPEVM | 功能描述:音頻 IC 開發工具 TPA701MSOP 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 |
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| TPA711_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER |
| TPA711D | 功能描述:音頻放大器 700mW Low Voltage 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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