- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄10459 > MAX9709ETN+D (Maxim Integrated Products)IC AMP AUDIO PWR 50W STER 56TQFN PDF資料下載
參數(shù)資料
| 型號： | MAX9709ETN+D |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 50W STER 56TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 37 |
| 類型： | D 類 |
| 輸出類型： | 1-通道（單聲道）或 2-通道（立體聲） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 50W x 1 @ 4 歐姆; 29W x 2 @ 8 歐姆 |
| 電源電壓： | 10 V ~ 22 V |
| 特點： | 消除爆音，差分輸入，靜音，短路和熱保護，關(guān)機 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 56-TQFN-EP（8x8） |
| 封裝/外殼： | 56-WFQFN 裸露焊盤 |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1392 (CN2011-ZH PDF) |
MAX9709
25W/50W, Filterless, Spread-Spectrum,
Stereo/Mono, Class D Amplifier
______________________________________________________________________________________
15
Sharing Input Sources
In certain systems, a single audio source can be
shared by multiple devices (speaker and headphone
amplifiers). When sharing inputs, it is common to mute
the unused device, rather than completely shutting it
down. This prevents the unused device inputs from dis-
torting the input signal. Mute the MAX9709 by driving
MUTE low. Driving MUTE low turns off the Class D out-
put stage, but does not affect the input bias levels of
the MAX9709.
Frequency Synchronization
The MAX9709 outputs up to 27W on each channel in
stereo mode. If higher output power or a 2.1 solution is
needed, two MAX9709s can be used. Each MAX9709
is synchronized by connecting SYNCOUT from the first
MAX9709 to SYNCIN of the second MAX9709 (see
Figure 5).
Supply Bypassing/Layout
Proper power-supply bypassing ensures low distortion
operation. For optimum performance, bypass PVDD to
PGND with a 0.1F capacitor as close to each PVDD
pin as possible. A low-impedance, high-current power-
supply connection to PVDD is assumed. Additional bulk
capacitance should be added, as required, depending
on the application and power-supply characteristics.
GND and PGND should be star-connected to system
ground. For the TQFN package, solder the exposed
paddle (EP) to the ground plane using multiple-plated
through-hole vias. The exposed paddle must be sol-
dered to the ground plane for rated power dissipation
and good ground return. Use wider PC board traces to
lower the parasitic resistance for the high-power output
pins (OUTR+, OUTR-, OUTL+, OUTL-). Refer to the
MAX9709 evaluation kit for layout guidance.
Thermal Considerations
Class D amplifiers provide much better efficiency and
thermal performance than a comparable Class AB
amplifier. However, the system’s thermal performance
must be considered with realistic expectations along
with its many parameters.
Continuous Sine Wave vs. Music
When a Class D amplifier is evaluated in the lab, often
a continuous sine wave is used as the signal source.
While this is convenient for measurement purposes, it
represents a worst-case scenario for thermal loading
on the amplifier. It is not uncommon for a Class D
amplifier to enter thermal shutdown if driven near maxi-
mum output power with a continuous sine wave. The
PC board must be optimized for best dissipation (see
the
PC Board Thermal Considerations section).
Audio content, both music and voice, has a much lower
RMS value relative to its peak output power. Therefore,
while an audio signal may reach similar peaks as a
continuous sine wave, the actual thermal impact on the
Class D amplifier is highly reduced. If the thermal per-
formance of a system is being evaluated, it is important
to use actual audio signals instead of sine waves for
testing. If sine waves must be used, the thermal perfor-
mance is less than the system’s actual capability for
real music or voice.
PC Board Thermal Considerations
The exposed pad is the primary route for conducting
heat away from the IC. With a bottom-side exposed
pad, the PC board and its copper becomes the primary
heatsink for the Class D amplifier. Solder the exposed
pad to a copper polygon. Add as much copper as pos-
sible from this polygon to any adjacent pin on the Class
D amplifier as well as to any adjacent components, pro-
vided these connections are at the same potential.
These copper paths must be as wide as possible. Each
of these paths contributes to the overall thermal capa-
bilities of the system.
The copper polygon to which the exposed pad is
attached should have multiple vias to the opposite side
of the PC board, where they connect to another copper
polygon. Make this polygon as large as possible within
the system’s constraints for signal routing.
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
out of the package, they do provide a small amount.
The total improvement would not exceed about 10%,
but it could make the difference between acceptable
performance and thermal problems.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VJ1210Y151JXEAT5Z | CAP CER 150PF 500V 5% X7R 1210 |
| MAX9708ETN+D | IC AMP AUDIO PWR 42W STER 56TQFN |
| VJ1210Y101MXPAT5Z | CAP CER 100PF 250V 20% X7R 1210 |
| MS27473T10B98SA | CONN PLUG 6POS STRAIGHT W/SCKT |
| VE-21Y-IU-F2 | CONVERTER MOD DC/DC 3.3V 132W |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9709EVKIT | 功能描述:音頻放大器 Evaluation Kit for the MAX9709 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 |
| MAX970EEE | 功能描述:校驗器 IC Quad uPower Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX970EEE+ | 功能描述:校驗器 IC Quad uPower Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX970EEE+T | 功能描述:校驗器 IC Quad uPower Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX970EEE-T | 功能描述:校驗器 IC Quad uPower Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。