參數(shù)資料
型號(hào)： MAX9742ETX+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 20/36頁(yè)
文件大?。?/td> 0K
描述： IC AMP AUDIO PWR 20.5W D 36TQFN
標(biāo)準(zhǔn)包裝： 2,500
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： 帶卷 (TR)
MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
______________________________________________________________________________________
27
AV -
RF
RIN_
RIN1 = RIN2, RF1 = RF2
DUAL-SUPPLY CONFIGURATION
MID
RF2
CFBR
RF1
CIN
RIN1
MAX9742
CIN
RIN2
RF1
INL-
INL+
CIN
RIN2
CIN
RIN1
INR+
INR-
CFBL
OUTL
+
-
+
-
+
-
CFBL
CFBR
OUTR
LF
CF
LF
CF
LEFT-CHANNEL
AUDIO INPUT
FBL
FBR
RIGHT-CHANNEL
AUDIO INPUT
VDD
VSS
Figure 14. Circuit Configuration for Minimizing Supply Pumping
Worst-case supply pumping occurs at high output pow-
ers with low-frequency signals and small load resis-
tances. Since the period is longer for low-frequency
signals, the continuous output current has more time to
pump up the supply rails during each cycle of the
audio signal. Additionally, for most stereo audio
sources the low-frequency audio content (bass) is pri-
marily monophonic. This means both output channels
are basically equal in magnitude and in phase at low
frequencies causing twice as much pump-up current to
flow into the supply bypass capacitors and therefore
doubling the supply pump-up voltages. Assuming
purely sinusoidal output signals, the worst-case supply
voltage increase due to supply pumping can be
approximated using the following equation:
where VPUMP_MAX is the magnitude increase of the
supply rail, VSUPPLY is the nominal voltage magnitude
of the respective supply, fOUT is the frequency of the
audio signal, and CSUPPLY is the value of the respec-
tive supply bypass capacitor. The above equation
shows that increasing the value of the supply bypass
capacitor decreases the supply voltage variations due
to supply pumping. Using large bypass capacitors
helps minimize supply voltage variations by providing
sufficient supply decoupling at low output frequencies.
To prevent the MAX9742 from entering supply overvolt-
age protection mode at low output frequencies (as low
as 20Hz), use supply bypass capacitors with values of
at least 1000F for dual-supply operation and 660F for
single-supply operation.
Alternate Methods for Mitigating Supply Pumping
Using the BTL configuration minimizes the supply
pumping effect since the outputs are driven 180° out-
of-phase with each other. Driving the outputs 180° out-
of-phase causes each half-bridge to pump up and
draw current from opposite supplies, which reduces
the magnitude of the of the supply pumping.
For the single-ended output configuration, the supply
pumping can be minimized by driving the channels
180° out-of-phase and reversing the polarity of one
speaker connection (see Figure 14). Reversing the
polarity of one speaker minimizes any adverse affects
on the audio quality by ensuring that the physical dis-
placement of the speaker cones matches the physical
displacement of the speakers when driven with in
phase signals.
V
2
1
f
R
C
PUMP_MAX
SUPPLY
2
OUT
SPKR
SUPPLY
=
×
××
π
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
MAX9744EVCMAXQU+ 功能描述:音頻放大器 Evaluation Kit/Evaluation System for the MAX9744 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
MAX9744EVKIT+ 功能描述:音頻放大器 Evaluation Kit/Evaluation System for the MAX9744 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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