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| 型号： | MAX9788ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/13页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 2.4W G 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 类型： | G 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： | 2.4W x 1 @ 8 欧姆 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 特点： | 消除爆音，差分输入，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1392 (CN2011-ZH PDF) |
MAX9788
Hold Capacitor (C2)
The output capacitor value and ESR directly affect the
ripple at PVSS. Increasing C2 reduces output ripple.
Likewise, decreasing the ESR of C2 reduces both rip-
ple and output resistance. A 10F capacitor is recom-
mended.
Charge-Pump Frequency Set Resistor (RFS)
The charge pump operates in two modes. When the
charge pump is loaded below 100mA, it operates in a
slow mode where the oscillation frequency is reduced to
1/4 of its normal operating frequency. Once loaded, the
charge-pump oscillation frequency returns to normal
operation. In applications where the design may be sen-
sitive to the operating charge-pump oscillation frequen-
cy, the value of the external resistor RFS can be changed
to adjust the charge-pump oscillation frequency shown
in Figure 4. A 100k
Ω resistor is recommended.
Ceramic Speaker Impedance
Characteristics
A 1F capacitor is a good model for the ceramic
speaker as it best approximates the impedance of a
ceramic speaker over the audio band. When selecting
a capacitor to simulate a ceramic speaker, the voltage
rating or the capacitor must be equal to or higher than
the expected output voltage swing. See Figure 5.
Series Load Resistor
The capacitive nature of the ceramic speaker results in
very low impedances at high frequencies. To prevent
the ceramic speaker from shorting the MAX9788 output
at high frequencies, a series load resistor must be
used. The output load resistor and the ceramic speaker
create a lowpass filter. To set the rolloff frequency of
the output filter, the approximate capacitance of the
speaker must be known. This information can be
obtained from bench testing or from the ceramic
speaker manufacturer. A series load resistor greater
than 10
Ω is recommended. Set the lowpass filter cutoff
frequency with the following equation:
WLP Applications Information
For the latest application details on WLP construction,
dimensions, tape carrier information, PCB techniques,
bump-pad layout, and recommended reflow tempera-
ture profile, as well as the latest information on reliability
testing results, go to the Maxim website at www.maxim-
ic.com/ucsp for the application note,
UCSP—A Wafer-
Level Chip-Scale Package.
f
RC
Hz
LP
L
SPEAKER
=
××
()
1
2
π
14VP-P, Class G Ceramic Speaker Driver
10
______________________________________________________________________________________
CHARGE-PUMP OSCILLATION
FREQUENCY vs. RFS
MAX9788
fig04
RFS (k
Ω)
CHARGE-PUMP
OSCILLATION
FREQUENCY
(kHz)
125
100
75
250
300
350
400
450
500
550
600
200
50
150
ILOAD > 100mA
IMPEDANCE vs. FREQUENCY
MAX9788
fig05
FREQUENCY (Hz)
IMPEDANCE
(Ω
)
10
1
0.1
0.01
100
1k
10k
100k
1M
10
0.001
100
1
μF CAPACITOR
CERAMIC
SPEAKER
Figure 4. Charge-Pump Oscillation Frequency vs. RFS
Figure 5. Ceramic Speaker and Capacitor Impedance
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9788ETI+ | 功能描述:音频放大器 14VP-P Class G Cer Speaker Driver 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 |
| MAX9788ETI+ | 制造商:Maxim Integrated Products 功能描述:IC AUDIO PWR AMP CLASS G 2.4W TQFN-28 |
| MAX9788ETI+T | 功能描述:音频放大器 14VP-P Class G Cer Speaker Driver 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 |
| MAX9788EVKIT+ | 功能描述:音频 IC 开发工具 MAX9788 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 |
| MAX9788EWP+TG45 | 功能描述:音频放大器 14VP-P Class G Cer Speaker Driver 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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