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参数资料
| 型号： | TPA6120A2DWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.08 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| 封装： | GREEN, PLASTIC, SOP-20 |
| 文件页数： | 6/25页 |
| 文件大小： | 611K |
| 代理商： | TPA6120A2DWPRG4 |
www.ti.com
+
RF = 1 kW
VCC+
RI = 1 kW
RO = 10 W
RL
VI
VCC
+
RF = 1 kW
VCC+
RI= 1 kW
RO = 10 W
RL
VI
VCC
VI+
RI = 1 kW
RF = 1 kW
TPA6120A2
SLOS431 – MARCH 2004
APPLICATION INFORMATION (continued)
The value of the feedback resistor should be chosen by using Figure 27 through Figure 32 as guidelines. The
gain can then be set by adjusting the input resistor. The smaller the feedback resistor, the less noise is
introduced into the system. However, smaller values move the dominant pole to higher and higher frequencies,
making the device more susceptible to oscillations. Higher feedback resistor values add more noise to the
system, but pull the dominant pole down to lower frequencies, making the device more stable. Higher impedance
loads tend to make the device more unstable. One way to combat this problem is to increase the value of the
feedback resistor. It is not recommended that the feedback resistor exceed a value of 10 k
. The typical value
for the feedback resistor for the TPA6120A2 is 1 k
. In some cases, where a high-impedance load is used along
with a relatively large gain and a capacitive load, it may be necessary to increase the value of the feedback
resistor from 1 k
to 2 k, thus adding more stability to the system. Another method to deal with oscillations is to
increase the size of RO.
CAUTION:
Do not place a capacitor in the feedback path. Doing so can cause oscillations.
Capacitance at the outputs can cause oscillations. Capacitance from some sources, such as layout, can be
minimized. Other sources, such as those from the load (e.g., the inherent capacitance in a pair of headphones),
cannot be easily minimized. In this case, adjustments to RO and/or RF may be necessary.
The series output resistor should be kept at a minimum of 10
. It is small enough so that the effect on the load
is minimal, but large enough to provide the protection necessary such that the output of the amplifier sees little
capacitance. The value can be increased to provide further isolation, up to 100
.
The series resistor, RS, should be used for two reasons:
1. It prevents the positive input pin from being exposed to capacitance from the line and source.
2. It prevents the source from seeing the input capacitance of the TPA6120A2.
The 50-
resistor was chosen because it provides ample protection without interfering in any noticeable way with
the signal. Not shown is another 50-
resistor that can be placed on the source side of R
S to ground. In that
capacity, it serves as an impedance match to any 50-
source.
Figure 25. Single-Ended Input With a Noninverting Gain of -1 V/V
Figure 26. Differential Input With a Noninverting Gain of 2 V/V
Figure 26 shows the TPA6120A2 connected with differential inputs. Differential inputs are useful because they
take the greatest advantage of the device's high CMRR. The two feedback resistor values must be kept the
same, as do the input resistor values.
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA6120A2EVM | 功能描述:音频 IC 开发工具 TPA6120A2 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TPA6120A2RGYEVM | 功能描述:TPA6120A2 - Headphones, 2-Channel (Stereo) Output Class AB Audio Amplifier Evaluation Board 制造商:texas instruments 系列:- 零件状态:有效 放大器类型:AB 类 输出类型:耳机，2-通道（立体声） 不同负载时的最大输出功率 x 通道数:80mW x 2 @ 600 欧姆 电压 - 电源:10 V ~ 30 V，±5 V ~ 15 V 板类型:完全填充 使用的 IC/零件:TPA6120A2 所含物品:板 标准包装:1 |
| TPA6120A2RGYT | 功能描述:Amplifier IC Headphones, 2-Channel (Stereo) Class AB 14-VQFN (3.5x3.5) 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 类型:AB 类 输出类型:耳机，2-通道（立体声） 不同负载时的最大输出功率 x 通道数:80mW x 2 @ 600 欧姆 电压 - 电源:10 V ~ 30 V，±5 V ~ 15 V 特性:差分输入，短路和热保护 安装类型:表面贴装 工作温度:-40°C ~ 85°C（TA） 供应商器件封装:14-VQFN（3.5x3.5） 封装/外壳:14-VFQFN 裸露焊盘 标准包装:1 |
| TPA6130A2 | 制造商:TI 制造商全称:Texas Instruments 功能描述:138-mW DIRECTPATH STEREO HEADPHONE AMPLIFIER WITH I2C VOLUME CONTROL |
| TPA6130A2_07 | 制造商:TI 制造商全称:Texas Instruments 功能描述:138-mW DIRECTPATH STEREO HEADPHONE AMPLIFIER WITH I2C VOLUME CONTROL |
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