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| 型号： | MAX9705CETB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/18页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 2.3W D 10TDFN |
| 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： | 1-通道（单声道） |
| 在某负载时最大输出功率 x 通道数量： | 2.3W x 1 @ 4 欧姆 |
| 电源电压： | 2.5 V ~ 5.5 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： | 10-TDFN-EP（3x3） |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | MAX9705CETB+TDKR |
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
______________________________________________________________________________________
11
Filterless Modulation/Common-Mode Idle
The MAX9705 uses Maxim’s unique modulation scheme
that eliminates the LC filter required by traditional
Class D amplifiers, improving efficiency, reducing com-
ponent count, and conserving board space and system
cost. Conventional Class D amplifiers output a 50% duty
cycle square wave when no signal is present. With no fil-
ter, the square wave appears across the load as a DC
voltage, resulting in a finite load current, increasing
power consumption. When no signal is present at the
input of the MAX9705, the outputs switch as shown in
Figure 3. Because the MAX9705 drives the speaker dif-
ferentially, the two outputs cancel each other, resulting
in no net idle-mode voltage across the speaker, minimiz-
ing power consumption.
Efficiency
Efficiency of a Class D amplifier is attributed to the
region of operation of the output stage transistors. In a
Class D amplifier, the output transistors act as current-
steering switches and consume negligible additional
power. Any power loss associated with the Class D out-
put stage is mostly due to the I2R loss of the MOSFET
on-resistance and supply current.
The theoretical best efficiency of a linear amplifier is
78%; however, that efficiency is only exhibited at peak
output powers. Under normal operating levels (typical
music reproduction levels), efficiency falls below 30%,
whereas the MAX9705 still exhibits >70% efficiencies
under the same conditions (Figure 4).
Shutdown
The MAX9705 has a shutdown mode that reduces power
consumption and extends battery life. Driving
SHDN low
places the MAX9705 in a low-power (0.3A) shutdown
mode. Connect
SHDN to VDD for normal operation.
Figure 2. MAX9705 Output with an Input Signal Applied (SSM Mode)
VOUT+ - VOUT-
tSW
VIN-
VIN+
OUT+
OUT-
tON(MIN)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9705DEBC+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9705DEBC+T | 功能描述:音频放大器 2.3W Ultra-Low-EMI 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 |
| MAX9705DETB+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO 2.3W CLS-D 10TDFN EP - Rail/Tube |
| MAX9705DETB+T | 功能描述:音频放大器 2.3W Ultra-Low-EMI 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 |
| MAX9706ETX+ | 功能描述:音频放大器 Integrated Circuits (ICs) 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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