參數(shù)資料
型號(hào): MAX9742ETX+
廠商: Maxim Integrated Products
文件頁(yè)數(shù): 11/36頁(yè)
文件大小: 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(shí)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(diǎn): 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
MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
______________________________________________________________________________________
19
Since each half-bridge output stage is only capable of
driving loads as small as 4 and each half-bridge sees
half of the differential load resistance when configured
for BTL, only use the BTL configuration with loads
greater than or equal to 8. The MAX9742 may be ther-
mally limited when using the BTL configuration with
high supply voltages due to the decreased load resis-
tance seen by each half bridge. For optimum perfor-
mance, the PCB should be thermally optimized to
achieve the continuous output powers required for the
application (see the
Thermal Considerations section).
Component Selection
Feedback Capacitor (CFB_)
To maximize dynamic range, an external feedback
capacitor (CFB_) is needed to generate an error signal
for the Class D modulator. The feedback capacitor con-
figures the input amplifier stage as an integrator whose
output is equal to an error signal consisting of the sum
of the integrated input audio and PWM output signals.
The integrator provides a noise-shaping function for the
closed-loop response of the amplifier.
AV_BTL = 2 ×
RF_
RIN_
RIN1 = RIN2, RF1 = RF2
MID
CLASS D
MODULATOR
AND GATE DRIVE
RF2
LF
RF2
CFBR
RF1
CZBL
RZBL
CIN
RIN1
MAX9742
CIN
RIN2
RF1
INL-
INL+
CIN
RIN2
CIN
RIN1
INR+
INR-
CFBL
DIFFERENTIAL
AUDIO INPUT
FBL
FBR
CF
OUTL
VDD
VSS
CF
CLASS D
MODULATOR
AND GATE DRIVE
OUTR
VDD
VSS
VOUT_P-P
VDD/2
VOUT_P-P
2 x VOUT_P-P
0V
Figure 7. Input Signal Source and Load Connections for BTL Operation
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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