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参数资料
| 型号： | TAS5121IDKD |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 100 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| 封装： | GREEN, PLASTIC, HSSOP-36 |
| 文件页数： | 5/22页 |
| 文件大小： | 632K |
| 代理商： | TAS5121IDKD |
www.ti.com
APPLICATION INFORMATION
DEMODULATION FILTER DESIGN
Output A
C1
TAS5121I
L
Output B
L
C2
R(Load)
S001601
TAS5121I
SLES122 – SEPTEMBER 2004
The TAS5121I amplifier outputs are driven by high-current DMOS transistors in an H-bridge configuration. These
transistors are either off or fully on.
The result is a square-wave output signal with a duty cycle that is proportional to the amplitude of the audio
signal. It is recommended that a second-order LC filter be used to recover the audio signal.
Figure 9. Demodulation Filter
The main purpose of the demodulation filter is to attenuate the high-frequency components of the output signals
that are out of the audio band.
Design of the demodulation filter significantly affects the audio performance of the power amplifier. Therefore, to
ensure proper operation of the OC protection circuit and meet the device THD+N specification, the selection of
the inductors used in the output filter should be carefully considered. The rule is that the inductance should
remain stable within the range of peak current seen at maximum output power and deliver approximately 5
H of
inductance at 15 A.
If this rule is observed, the TAS5121I should not have distortion issues due to the output inductors. This prevents
device damage due to overcurrent conditions because of inductor saturation in the output filter.
Another parameter to be considered is the idle current loss in the inductor. This can be measured or specified as
inductor dissipation (D). The target specification for dissipation is less than 0.05. If this specification is not met,
idle current increases.
In general, 10-
H inductors suffice for most applications. The frequency response of the amplifier is slightly
altered by the change in output load resistance; however, unless tight control of frequency response is necessary
(better than 0.5 dB), it is not necessary to deviate from 10
H.
The graphs in Figure 10 display the inductance-versus-current characteristics of two inductors that are suggested
for use with the TAS5121I.
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TAS5121IDKDE4 | 功能描述:音频放大器 Digital Amplifier Power Stage 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 |
| TAS5121IDKDR | 功能描述:音频放大器 Digital Amplifier Power Stage 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 |
| TAS5121IDKDRE4 | 功能描述:音频放大器 Digital Amplifier Power Stage 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 |
| TAS5122 | 制造商:TI 制造商全称:Texas Instruments 功能描述:30W STEREO DIGITAL AMPLIFIER POWER STAGE |
| TAS5122_07 | 制造商:TI 制造商全称:Texas Instruments 功能描述:30-W STEREO DIGITAL AMPLIFIER POWER STAGE |
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