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參數(shù)資料
| 型號： | MAX9742ETX+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 5/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 20.5W D 36TQFN |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類型： | D 類 |
| 輸出類型： | 2 通道（立體聲） |
| 在某負(fù)載時最大輸出功率 x 通道數(shù)量： | 20.5W x 2 @ 8 歐姆 |
| 電源電壓： | 20 V ~ 40 V，±10 V ~ 20 V |
| 特點： | 消除爆音，差分輸入，靜音，短路和熱保護(hù)，關(guān)機(jī) |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 36-TQFN 裸露焊盤（6x6） |
| 封裝/外殼： | 36-WFQFN 裸露焊盤 |
| 包裝： | 管件 |
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MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
______________________________________________________________________________________
13
Detailed Description
The MAX9742 is a two-channel, single-ended Class D
stereo amplifier capable of providing 16W of output
power on each channel into 4 loads in single- or dual-
supply operation. The amplifier can also provide 32W
of output power in a mono bridge-tied-load (BTL) con-
figuration. The device offers Class AB audio perfor-
mance with Class D efficiency.
The differential input architecture reduces common-
mode noise pickup. The device can also be configured
for single-ended input signals.
The connection of external feedback components
allows custom gain settings.
Class D Operation and Efficiency
Class D amplifiers are switch-mode devices capable of
significantly higher power efficiencies in comparison to
linear amplifiers. The output stage of the MAX9742 con-
sists of a half-bridge speaker driver (see Figure 2). The
high 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 by switching the output between VDD
and VSS (ground for single-supply operation). 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
______________________________________________________________________________________
13
Pin Description (continued)
PIN
NAME
FUNCTION
24
BOOTR
Right-Channel Bootstrap Capacitor. Connect a 0.1F capacitor between BOOTR and OUTR.
25, 26
OUTR
Right Speaker Output
29, 30,
34, 35
VDD
Positive Power-Supply Input. Bypass VDD to LGND with a 0.1F plus additional bulk capacitance. See
the Supply Pumping Effects section.
31, 32, 33
VSS
Negative Power-Supply Input. For dual-supply operation, connect to negative power-supply voltage
and bypass VSS to LGND with a 0.1F plus additional bulk capacitance. For single-supply operation,
connect to LGND.
EP
Exposed Paddle. EP is internally connected to device substrate. Connect EP to VSS through a large
section of copper to maximize power dissipation.
OUTL
OUTR
CF
LF
RL
AUX-0025
FILTER
AUDIO
ANALYZER
SINGLE-ENDED CONFIGURATION
BTL CONFIGURATION
MAX9742
CF
LF
RL
OUTL
+
-
+
-
+
-
+
-
+
-
+
-
OUTR
CF
LF
RL
AUX-0025
FILTER
AUDIO
ANALYZER
MAX9742
CF
LF
NOTE: SINGLE-ENDED CONFIGURATION IS AC-COUPLED IN SINGLE-SUPPLY MODE.
Figure 1. Test Circuits for Single-Ended and BTL Configurations
Test Circuits
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9742ETX+ | 功能描述:音頻放大器 Stereo 16W Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9742ETX+T | 功能描述:音頻放大器 Stereo 16W Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9742EVKIT+ | 功能描述:音頻放大器 Evaluation Kit for the MAX9742 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9744ETH+ | 功能描述:音頻放大器 Stereo 20W Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9744ETH+T | 功能描述:音頻放大器 Stereo 20W Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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