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参数资料
| 型号： | MAX9768ETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/26页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO 10W MONO D 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 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： | 10W x 1 @ 8 欧姆 |
| 电源电压： | 4.5 V ~ 14 V |
| 特点： | 消除爆音，I²C，静音，短路和热保护，关机，音量控制 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 管件 |
Filterless Modulation/PWM Modulation
The MAX9768 features two output modulation
schemes: filterless modulation or classic PWM, selec-
table through SCLK when the device is in analog mode
(ADDR2 and ADDR1 = GND, Table 2) or through the
I2C interface (Table 7). Maxim’s unique, filterless modu-
lation scheme eliminates the LC filter required by tradi-
tional Class D amplifiers, reducing component count,
conserving board space and system cost. Although the
MAX9768 meets FCC and other EMI limits with a low-
cost ferrite bead filter, many applications still may want
to use a full LC-filtered output. If using a full LC filter,
the performance is best with the MAX9768 configured
for classic PWM output.
Switching between schemes while in normal operating
mode with the I2C interface, the output is not click-and-
pop protected. To have click-and-pop protection when
switching between output schemes, the device must
enter shutdown mode and be configured to the new out-
put scheme before the startup sequence is terminated.
The startup time for the MAX9768 is typically 220ms.
The startup time for the MAX9768B is typically 15ms.
Efficiency
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 current-steering
switches and consume negligible additional power.
Any power loss associated with the Class D output
stage is mostly due to the I2R loss of the MOSFET on-
resistance, and quiescent-current overhead.
The theoretical best efficiency of a linear amplifier is
78%, however, that efficiency is only exhibited at peak
output power. Under normal operating levels (typical
music reproduction levels), efficiency falls below 30%,
whereas the MAX9768 still exhibits > 80% efficiencies
under the same conditions (Figure 2).
Soft Current Limit
When the output current exceeds the soft current limit,
2A (typ), the MAX9768 enters a cycle-by-cycle current-
limit mode. In soft current-limit mode, the output is
clipped at 2A. When the output decreases so the out-
put current falls below 2A, normal operation resumes.
The effect of soft current limiting is a slight increase in
distortion. Most applications will not enter soft current-
limit mode unless the speaker or filter creates imped-
ance nulls below 8
Ω.
MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
14
______________________________________________________________________________________
Table 2. Modulation Scheme Selection In Analog Mode
ADDR2
ADDR1
SDA/VOL
SCLK
FUNCTION
0
Analog Volume Control
0
Filterless Modulation
0
Analog Volume Control
1
Classic PWM (50% Duty Cycle)
EFFICIENCY vs. OUTPUT POWER
MAX9768
fig02
OUTPUT POWER (W)
EFFICIENCY
(%)
8
6
4
2
10
20
30
40
50
60
70
80
90
100
0
010
MAX9768
CLASS AB
PVDD = 12V
fIN = 1kHz
RL = 8
Ω
Figure 2. MAX9768 Efficiency vs. Class AB Efficiency
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9768ETG+ | 功能描述:音频放大器 10W Mono Class D Speaker 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 |
| MAX9768ETG+T | 功能描述:音频放大器 10W Mono Class D Speaker 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 |
| MAX9768EVCMAXQU+ | 功能描述:音频放大器 Evaluation Kit/Evaluation System for the MAX9768 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 |
| MAX9768EVKIT+ | 功能描述:音频 IC 开发工具 MAX9768 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 |
| MAX976ESA | 功能描述:校验器 IC Dual High Speed Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
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