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参数资料
| 型号： | TPA321DRG4 |
| 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： | 9/29页 |
| 文件大小： | 773K |
| 代理商： | TPA321DRG4 |
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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)
3 dB
fc
fc +
1
2p R
F
C
F
(7)
Input Capacitor, CI
TPA321
SLOS312C – JUNE 2000 – REVISED JUNE 2004
The gain for each audio input of the TPA321 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 TPA321 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 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, place a small
compensation capacitor (CF) of approximately 5 pF in parallel with RF when RF is greater than 50 k. In effect,
this creates a low-pass filter network with the cutoff frequency defined in Equation 7.
For example, if RF is 100 k and CF is 5 pF then fc is 318 kHz, which is well outside of audio range.
In the typical application, input capacitor CI is required to allow the amplifier to bias the input signal to the proper
dc level for optimum operation. In this case, CI and RI form a high-pass filter with the corner frequency
determined in Equation 8.
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA321EVM | 功能描述:音频 IC 开发工具 TPA321 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 |
| TPA3221DDV | 功能描述:HIGH POWER AMPLIFIER 制造商:texas instruments 系列:- 包装:管件 零件状态:在售 类型:D 类 电压 - 电源:7 V ~ 32 V 安装类型:表面贴装 工作温度:0°C ~ 70°C 供应商器件封装:44-HTSSOP 封装/外壳:44-TSSOP（0.240"，6.10mm 宽）裸露焊盘 标准包装:35 |
| TPA3244DDWR | 功能描述:IC AMP AUDIO CLASS D 44-HTSSOP 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:在售 类型:D 类 输出类型:2 通道（立体声） 不同负载时的最大输出功率 x 通道数:60W x 2 @ 8 欧姆 电压 - 电源:12 V ~ 31.5 V 特性:消除爆音，短路保护 安装类型:表面贴装 工作温度:最高 750.2°F（399°C） 供应商器件封装:44-HTSSOP 封装/外壳:44-TSSOP（0.240"，6.10mm 宽）裸露焊盘 标准包装:1 |
| TPA3244EVM | 功能描述:EVAL BOARD FOR TPA3244 制造商:texas instruments 系列:PurePath? 零件状态:在售 放大器类型:D 类 输出类型:2 通道（立体声） 不同负载时的最大输出功率 x 通道数:100W x 2 @ 4 欧姆 电压 - 电源:14 V ~ 31.5 V 板类型:完全填充 使用的 IC/零件:TPA3244 所含物品:板 标准包装:1 |
| TPA3245DDV | 功能描述:IC AUDIO AMP CLASS D 44HTSSOP 制造商:texas instruments 系列:PurePath? 包装:管件 零件状态:在售 类型:D 类 输出类型:2 通道（立体声） 不同负载时的最大输出功率 x 通道数:115W x 2 @ 2 欧姆，230W x 1 @ 4 欧姆 电压 - 电源:12 V ~ 30 V 特性:消除爆音，短路和热保护 安装类型:表面贴装 工作温度:0°C ~ 70°C（TA） 供应商器件封装:44-HTSSOP 封装/外壳:44-PowerTSSOP（0.240"，6.10mm 宽） 标准包装:35 |
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