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參數(shù)資料
| 型號： | MAX9703ETJ+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 5/20頁 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 18W MONO 32TQFN |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 60 |
| 類型： | D 類 |
| 輸出類型： | 1-通道（單聲道） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 18W x 1 @ 16 歐姆 |
| 電源電壓： | 10 V ~ 25 V |
| 特點： | 消除爆音，差分輸入，靜音，短路和熱保護，關機 |
| 安裝類型： | 表面貼裝 |
| 供應商設備封裝： | 32-TQFN-EP（5x5） |
| 封裝/外殼： | 32-WFQFN 裸露焊盤 |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1392 (CN2011-ZH PDF) |
MAX9703/MAX9704
10W Stereo/15W Mono, Filterless,
Spread-Spectrum, Class D Amplifiers
______________________________________________________________________________________
13
Additional improvements are possible if all the traces
from the device are made as wide as possible. Although
the IC pins are not the primary thermal path of the pack-
age, they do provide a small amount. The total improve-
ment would not exceed about 10%, but it could make the
difference between acceptable performance and ther-
mal problems.
Auxiliary Heatsinking
If operating in higher ambient temperatures, it is possible
to improve the thermal performance of a PC board with
the addition of an external heatsink. The thermal resis-
tance to this heatsink must be kept as low as possible to
maximize its performance. With a bottom-side exposed
pad, the lowest resistance thermal path is on the bottom
of the PC board. The topside of the IC is not a significant
thermal path for the device, and therefore is not a cost-
effective location for a heatsink.
Thermal Calculations
The die temperature of a Class D amplifier can be esti-
mated with some basic calculations. For example, the
die temperature is calculated for the below conditions:
TA = +40°C
POUT = 2x8W = 16W
RL = 16Ω
Efficiency (η) = 87%
θJA = 27°C/W
First, the Class D amplifier’s power dissipation must be
calculated.
Then the power dissipation is used to calculate the die
temperature, TC, as follows:
TC = TA + PDISS x
θJA
= 40°C + 2.4W x 27°C/W
= 104.8°C
Decreasing the ambient temperature or reducing
θJA will
improve the die temperature of the MAX9704.
θJA can
be reduced by increasing the copper size/weight of the
ground plane connected to the exposed paddle of the
MAX9704 TQFN package. Additionally,
θJA can be
reduced by attaching a heatsink, adding a fan, or mount-
ing a vertical PC board.
Load Impedance
The on-resistance of the MOSFET output stage in Class
D amplifiers affects both the efficiency and the peak-cur-
rent capability. Reducing the peak current into the load
reduces the I2R losses in the MOSFETs, thereby increas-
ing efficiency. To keep the peak currents lower, choose
the highest impedance speaker which can still deliver
the desired output power within the voltage swing limits
of the Class D amplifier and its supply voltage.
Although most loudspeakers are either 4
Ω or 8Ω, there
are other impedances available which can provide a
more thermally efficient solution.
Another consideration is the load impedance across the
audio frequency band. A loudspeaker is a complex
electromechanical system with a variety of resonances.
In other words, an 8
Ω speaker is usually only 8Ω imped-
ance within a very narrow range, and often extends well
below 8
Ω, reducing the thermal efficiency below what is
expected. This lower-than-expected impedance can be
further reduced when a crossover network is used in a
multi-driver audio system.
Optimize MAX9703/MAX9704 Efficiency with
Load Impedance and Supply Voltage
To optimize the efficiency of the MAX9703/MAX9704,
load the output stage with 12
Ω to 16Ω speakers. The
MAX9703/MAX9704 exhibits highest efficiency perfor-
mance when driving higher load impedance (see the
Typical Operating Characteristics). If a 12
Ω to 16Ω load
is not available, select a lower supply voltage when dri-
ving 6
Ω to 10Ω loads.
P
W
WW
DISS
OUT
.
=
=
η
16
087
16
2 4
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9703ETJ+ | 功能描述:音頻放大器 10W Stereo/15W Mono 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9703ETJ+T | 功能描述:音頻放大器 10W Stereo/15W Mono 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9703ETJ-T | 功能描述:音頻放大器 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9704ETJ | 功能描述:音頻放大器 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9704ETJ+ | 功能描述:音頻放大器 10W Stereo/15W Mono 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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