参数资料
型号: MAX9742ETX+
厂商: Maxim Integrated Products
文件页数: 11/36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
MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
______________________________________________________________________________________
19
Since each half-bridge output stage is only capable of
driving loads as small as 4 and each half-bridge sees
half of the differential load resistance when configured
for BTL, only use the BTL configuration with loads
greater than or equal to 8. The MAX9742 may be ther-
mally limited when using the BTL configuration with
high supply voltages due to the decreased load resis-
tance seen by each half bridge. For optimum perfor-
mance, the PCB should be thermally optimized to
achieve the continuous output powers required for the
application (see the
Thermal Considerations section).
Component Selection
Feedback Capacitor (CFB_)
To maximize dynamic range, an external feedback
capacitor (CFB_) is needed to generate an error signal
for the Class D modulator. The feedback capacitor con-
figures the input amplifier stage as an integrator whose
output is equal to an error signal consisting of the sum
of the integrated input audio and PWM output signals.
The integrator provides a noise-shaping function for the
closed-loop response of the amplifier.
AV_BTL = 2 ×
RF_
RIN_
RIN1 = RIN2, RF1 = RF2
MID
CLASS D
MODULATOR
AND GATE DRIVE
RF2
LF
RF2
CFBR
RF1
CZBL
RZBL
CIN
RIN1
MAX9742
CIN
RIN2
RF1
INL-
INL+
CIN
RIN2
CIN
RIN1
INR+
INR-
CFBL
DIFFERENTIAL
AUDIO INPUT
FBL
FBR
CF
OUTL
VDD
VSS
CF
CLASS D
MODULATOR
AND GATE DRIVE
OUTR
VDD
VSS
VOUT_P-P
VDD/2
VOUT_P-P
2 x VOUT_P-P
0V
Figure 7. Input Signal Source and Load Connections for BTL Operation
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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