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| 型号： | MAX98400AETX+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/26页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO STEREO D 36TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | D 类 |
| 输出类型： | 2 通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 20W x 2 @ 8 欧姆 |
| 电源电压： | 8 V ~ 28 V |
| 特点： | 消除爆音，差分输入，短路和热保护，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 包装： | 管件 |
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
18
Preamplifier Gain Setting
The ICs offer eight pin-selectable gain settings, select-
able through the G1 and G2 pins.
Protection
The ICs feature overcurrent protection and two types of
thermal protection: thermal foldback and overtempera-
ture protection.
Thermal Foldback
The ICs feature thermal foldback that helps prevent
unwanted thermal-shutdown events. If activated, ther-
mal foldback attenuates the stereo output signal once
the internal junction temperature exceeds +130NC.
Attenuation is applied proportionally as the junction tem-
perature (TJ) exceeds the fixed +130NC threshold. The
thermal-foldback mode is controlled by the TEMPLOCK
pin.
Overtemperature Protection
The ICs feature an overtemperature protection that dis-
ables the amplifier if the junction temperature exceeds
+165NC. Once the amplifier is disabled and the die tem-
perature has cooled by 20NC, the devices enable again
and resume normal operation.
Overcurrent Protection
When the output current reaches the current limit, 5A
(typ), the ICs disable the outputs and initiate a recovering
sequence. The shutdown and recovering sequence is
repeated until the output fault is removed.
Applications Information
Filterless Class D Operation
Traditional Class D amplifiers require an output filter
to recover the audio signal from the amplifier’s output.
The filters add cost, increase the solution size of the
amplifier, and can decrease efficiency and THD+N
performance. The traditional PWM scheme uses large
differential output swings (2 x VDD peak-to-peak) and
causes large ripple currents. Any parasitic resistance in
the filter components results in a loss of power, lowering
the efficiency.
These ICs do not require an output filter. The devices
rely on the inherent inductance of the speaker coil and
the natural filtering of both the speaker and the human
ear to recover the audio component of the square-wave
output. Eliminating the output filter results in a smaller,
lower cost solution.
Because the frequency of the ICs’ output is well beyond
the bandwidth of most speakers, voice coil movement
due to the square-wave frequency is very small. For
optimum results, use a speaker with a series inductance
> 10FH. Typical 8I speakers exhibit series inductances
in the 20FH to 100FH range.
Table 2. Gain Selection
G1
G2
GAIN SETTING
(dB)
GND
9
Unconnected
GND
13
VS
GND
16.7
GND
Unconnected
20.1
Unconnected
23.3
VS
Unconnected
26.4
GND
VS
29.8
Unconnected
VS
32.9
VS
Reserved
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX98400AETX+ | 功能描述:音频放大器 Stereo Class D Amplifier 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 |
| MAX98400AETX+T | 功能描述:音频放大器 Stereo Class D Amplifier 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 |
| MAX98400AEVKIT+ | 功能描述:音频 IC 开发工具 MAX98400A Eval Kit 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 |
| MAX98400BETG+ | 功能描述:音频放大器 Stereo Class D Amplifier 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 |
| MAX98400BETG+T | 功能描述:音频放大器 Stereo Class D Amplifier 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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