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参数资料
| 型号： | MAX9742ETX+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/36页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 20.5W D 36TQFN |
| 标准包装： | 50 |
| 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： | 20.5W x 2 @ 8 欧姆 |
| 电源电压： | 20 V ~ 40 V，±10 V ~ 20 V |
| 特点： | 消除爆音，差分输入，静音，短路和热保护，关机 |
| 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 |
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MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
______________________________________________________________________________________
27
AV -
RF
RIN_
RIN1 = RIN2, RF1 = RF2
DUAL-SUPPLY CONFIGURATION
MID
RF2
CFBR
RF1
CIN
RIN1
MAX9742
CIN
RIN2
RF1
INL-
INL+
CIN
RIN2
CIN
RIN1
INR+
INR-
CFBL
OUTL
+
-
+
-
+
-
CFBL
CFBR
OUTR
LF
CF
LF
CF
LEFT-CHANNEL
AUDIO INPUT
FBL
FBR
RIGHT-CHANNEL
AUDIO INPUT
VDD
VSS
Figure 14. Circuit Configuration for Minimizing Supply Pumping
Worst-case supply pumping occurs at high output pow-
ers with low-frequency signals and small load resis-
tances. Since the period is longer for low-frequency
signals, the continuous output current has more time to
pump up the supply rails during each cycle of the
audio signal. Additionally, for most stereo audio
sources the low-frequency audio content (bass) is pri-
marily monophonic. This means both output channels
are basically equal in magnitude and in phase at low
frequencies causing twice as much pump-up current to
flow into the supply bypass capacitors and therefore
doubling the supply pump-up voltages. Assuming
purely sinusoidal output signals, the worst-case supply
voltage increase due to supply pumping can be
approximated using the following equation:
where VPUMP_MAX is the magnitude increase of the
supply rail, VSUPPLY is the nominal voltage magnitude
of the respective supply, fOUT is the frequency of the
audio signal, and CSUPPLY is the value of the respec-
tive supply bypass capacitor. The above equation
shows that increasing the value of the supply bypass
capacitor decreases the supply voltage variations due
to supply pumping. Using large bypass capacitors
helps minimize supply voltage variations by providing
sufficient supply decoupling at low output frequencies.
To prevent the MAX9742 from entering supply overvolt-
age protection mode at low output frequencies (as low
as 20Hz), use supply bypass capacitors with values of
at least 1000F for dual-supply operation and 660F for
single-supply operation.
Alternate Methods for Mitigating Supply Pumping
Using the BTL configuration minimizes the supply
pumping effect since the outputs are driven 180° out-
of-phase with each other. Driving the outputs 180° out-
of-phase causes each half-bridge to pump up and
draw current from opposite supplies, which reduces
the magnitude of the of the supply pumping.
For the single-ended output configuration, the supply
pumping can be minimized by driving the channels
180° out-of-phase and reversing the polarity of one
speaker connection (see Figure 14). Reversing the
polarity of one speaker minimizes any adverse affects
on the audio quality by ensuring that the physical dis-
placement of the speaker cones matches the physical
displacement of the speakers when driven with in
phase signals.
V
2
1
f
R
C
PUMP_MAX
SUPPLY
2
OUT
SPKR
SUPPLY
=
×
××
π
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9742ETX+ | 功能描述:音频放大器 Stereo 16W 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 |
| MAX9742ETX+T | 功能描述:音频放大器 Stereo 16W 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 |
| MAX9742EVKIT+ | 功能描述:音频放大器 Evaluation Kit for the MAX9742 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 |
| MAX9744ETH+ | 功能描述:音频放大器 Stereo 20W 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 |
| MAX9744ETH+T | 功能描述:音频放大器 Stereo 20W 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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