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参数资料
| 型号： | TAS5424ATPHDRMQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 116 W, 4 CHANNEL, AUDIO AMPLIFIER, PQFP64 |
| 封装： | PLASTIC, HTQFP-64 |
| 文件页数： | 32/51页 |
| 文件大小： | 1422K |
| 代理商： | TAS5424ATPHDRMQ1 |
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SLOS535B – MAY 2009 – REVISED JANUARY 2010
www.ti.com
Parallel Operation (PBTL)
The TAS5414A and TAS5424A can be used to drive four 4-
loads, two 2- loads, or even one 1- load by
paralleling BTL channels on the load side of the LC output filter. For parallel operation, identical I2C settings are
required for any two paralleled channels (especially gain and current-limit settings) in order to have reliable
system performance and evenly dissipated power on multiple channels. Having identical gain and current-limit
settings can also prevent energy feeding back from one channel to the other. For smooth power up, power down,
and mute operation, the same control commands (such as mute, play, Hi-Z, etc.) should be sent to the paralleled
channels at the same time. Load diagnostic is also supported for parallel connection. Paralleling on the
TAS5414A and TAS5424A side of the LC output filter is not supported, and can result in device failure.
Input Filter Design
For the TAS5424A device, the input filter for a single channel's P and M inputs should be identical. For the
TAS5414A the IN_M pin should have an impedance to GND that is equivalent to the parallel combination of the
input impedances of all IN_P channels combined, including any source impedance from the previous stage in the
system design. For example, if each of the 4 IN_P channels have a 1uF DC blocking capacitor, 1k
Ω of series
resistance due to an input RC filter, and 1k
Ω of source resistance from the DAC supplying the audio signal, the
IN_M channel should have a 4uF capacitor in series with a 500
Ω resistor to GND (4 x 1uF in parellel = 4uF; 4 x
2k
Ω in parallel = 500Ω).
Demodulation Filter Design
The TAS5414A and TAS5424A amplifier outputs are driven by high-current LDMOS 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. 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 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 mH of inductance at 16 A. If this rule is observed, the TAS5414A and TAS5424A should not have distortion
issues due to the output inductors. 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 the dissipation factor is above this value, idle current increases. In general, 10-mH 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 mH.
Line Driver Applications
In many automotive audio applications the end user would like to use the same head unit to drive either a
speaker (with several Ohms of impedance) or an external amplifier (with several kOhms of impedance). The
TAS5414A and the TAS5424A are capable of supporting both applications. However, the output filter must be
sized appropriately to handle the expected output load in either case (i.e. different output filter values need to be
populated to handle the two different cases). If the user would like to use the same output filter for both
applications additional hardware measures such as a Zobel filter are needed to ensure output stability for both
loading conditions. Please refer to the TAS54x4A hardware application note for additional details.
Thermal Information
The thermally augmented package provided with the TAS5414A and TAS5424A is designed to interface directly
to heat sinks using a thermal interface compound (for example, Artic Silver, Ceramique thermal compound.) The
heat sink then absorbs heat from the ICs and couples it to the local air. If louvers or fans are supplied, this
process can reach equilibrium and heat can be continually removed from the ICs. Because of the efficiency of
the TAS5414A and TAS5424A, heat sinks can be smaller than those required for linear amplifiers of equivalent
performance.
RqJA is a system thermal resistance from junction to ambient air. As such, it is a system parameter with the
following components:
RqJC (the thermal resistance from junction to case, or in this case the heat slug)
38
Copyright 2009–2010, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TAS5424ATPHDRQ1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:FOUR-CHANNEL AUTOMOTIVE DIGITAL AMPLIFIERS |
| TAS5424BQ1DKDEVM | 功能描述:音频 IC 开发工具 TAS5424BQ1DKD 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 |
| TAS5424BTDKDQ1 | 制造商:Texas Instruments 功能描述:- Trays |
| TAS5424BTDKDRQ1 | 功能描述:音频放大器 Four-CH Auto Digital Amps 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 |
| TAS5424BTDKEQ1 | 制造商:Texas Instruments 功能描述:- Trays |
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