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参数资料
| 型号： | TPA721DRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 7/26页 |
| 文件大小： | 663K |
| 代理商： | TPA721DRG4 |
www.ti.com
APPLICATION SCHEMATICS
Audio
Input
Bias
Control
VDD
700 mW
6
5
7
VO+
VDD
1
2
4
BYPASS
IN–
VDD/2
CI
CS
1
F
CB
2.2
F
SHUTDOWN
VO– 8
GND
From System Control
3
IN+
RI
10 k
RF
50 k
–
+
–
+
COMPONENT SELECTION
Gain-Setting Resistors, RF and RI
BTL gain + * 2
R
F
R
I
(5)
Effective impedance +
R
F
R
I
R
F )
R
I
(6)
TPA721
SLOS231E – NOVEMBER 1998 – REVISED JUNE 2004
Figure 26 is a schematic diagram of a typical handheld audio application circuit, configured for a gain of –10 V/V.
Figure 26. TPA721 Application Circuit
The following sections discuss the selection of the components used in Figure 26.
The gain for each audio input of the TPA721 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 TPA721 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 startup 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 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.
15
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| TPA721EVM | 制造商:TI 制造商全称:Texas Instruments 功能描述:700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER |
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| TPA731 | 制造商:TI 制造商全称:Texas Instruments 功能描述:700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER WITH DIFFERENTIAL INPUTS |
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| TPA731D | 功能描述:音频放大器 700mW Low V RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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