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参数资料
| 型号： | MAX9736BETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/25页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO 15W MONO D 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | D 类 |
| 输出类型： | 1-通道（单声道）或 2-通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 15W x 1 @ 4 欧姆; 7.5W x 2 @ 8 欧姆 |
| 电源电压： | 8 V ~ 28 V |
| 特点： | 消除爆音，静音，短路保护和热保护，关机 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
MAX9736
Mono/Stereo High-Power Class D Amplifier
14
______________________________________________________________________________________
Detailed Description
The MAX9736A/B/D filterless, stereo Class D audio
power amplifiers offer Class AB performance and Class
D efficiency with minimal board space. The MAX9736A
outputs 2x15W in stereo mode and 30W in mono mode.
The MAX9736B/D output 2x6W in stereo mode and 12W
in mono mode. These devices operate from an 8V to
28V supply range.
The MAX9736 features a filterless, spread-spectrum
switching mode (MOD = high) or a classic PWM fixed-
frequency switching mode (MOD = low).
The MAX9736 features externally set gain and a low-
power shutdown mode that reduces supply current to
less than 1A. Comprehensive click-and-pop circuitry
minimizes noise into and out of shutdown or mute.
Operating Modes
Filterless Modulation/PWM Modulation
The MAX9736 features two output modulation schemes,
filterless modulation (MOD = high) or classic PWM (MOD
= low). Maxim’s unique, filterless modulation scheme
eliminates the LC filter required by traditional Class D
amplifiers, reducing component count, conserving
board space, and reducing system cost. Configure for
classic PWM output when using a full LC filter.
Click-and-pop protection does not apply when the out-
put is switching between modulation schemes. To
maintain click-and-pop protection when switching
between output schemes the device must enter shut-
down mode and be configured to the new output
scheme before the startup sequence is finished.
Spread-Spectrum Mode
The MAX9736 features a unique spread-spectrum mode
that flattens the wideband spectral components, improv-
ing EMI radiated by the speaker and cables. The
switching frequency of the Class D amplifier varies ran-
domly by ±6kHz around the 300kHz center frequency.
Instead of a large amount of spectral energy present at
multiples of the switching frequency, the energy is
spread over a bandwidth that increases with frequency.
Above a few megahertz, the wideband spectrum looks
like white noise for EMI purposes. A proprietary amplifier
topology ensures this white noise does not corrupt the
noise floor in the audio bandwidth. The spread-spec-
trum mode is enabled only with filterless modulation.
Efficiency
The high efficiency of a Class D amplifier is due to the
switching operation of the output stage transistors. In a
Class D amplifier, the output transistors act as switches
and consume negligible power. Power loss associated
with the Class D output stage is due to the I2R loss of
the MOSFET on-resistance, various switching losses,
and quiescent current overhead.
The theoretical best efficiency of a linear amplifier is 78%
at peak output power. Under typical music reproduction
levels, the efficiency falls below 30%, whereas the
MAX9736 exhibits > 80% efficiency under the same con-
ditions (Figure 1).
Shutdown
The MAX9736 features a shutdown mode that reduces
power consumption and extends battery life in portable
applications. The shutdown mode reduces supply cur-
rent to 1A (typ). Drive
SHDN high for normal opera-
tion. Drive
SHDN low to place the device in low-power
shutdown mode. In shutdown mode, the outputs are
high impedance; and the common-mode voltage at the
output decays to zero. In shutdown mode, connect
REGEN low to minimize current consumption.
Mute Function
The MAX9736 features a clickless-and-popless mute
mode. When the device is muted, the signal is attenuat-
ed at the speaker and the outputs stop switching. To
mute the MAX9736, drive
MUTE low. Hold MUTE low
during system power-up and power-down to ensure
that clicks and pops caused by circuits before the
MAX9736 are suppressed.
EFFICIENCY
vs. TOTAL OUTPUT POWER
MAX9736
fig01
TOTAL OUTPUT POWER (W)
EFFICIENCY
(%)
15
10
5
10
20
30
40
50
60
70
80
90
100
0
020
MAX9736A
CLASS AB
Figure 1. MAX9736A Efficiency vs. Class AB Efficiency
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9736DETJ+ | 功能描述:音频放大器 Mono/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 |
| MAX9736DETJ+T | 功能描述:音频放大器 Mono/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 |
| MAX9736DEVKIT+ | 功能描述:音频放大器 EVKIT for MAX9736d 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 |
| MAX9737ETG/V+ | 制造商:Maxim Integrated Products 功能描述:MONO 7W CLASS D AMPLIFIER - Rail/Tube 制造商:Maxim Integrated Products 功能描述:IC AMP MONO 7W CLASS D 24-TQFN |
| MAX9737ETG/V+T | 制造商:Maxim Integrated Products 功能描述:MONO 7W CLASS D AMPLIFIER - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC AMP MONO 7W CLASS D 24-TQFN 制造商:Maxim Integrated Products 功能描述:Mono 7W Class D Amplifier |
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