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參數(shù)資料
| 型號： | MAX98400BEVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 10/26頁 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX98400B |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
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Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
18
Preamplifier Gain Setting
The ICs offer eight pin-selectable gain settings, select-
able through the G1 and G2 pins.
Protection
The ICs feature overcurrent protection and two types of
thermal protection: thermal foldback and overtempera-
ture protection.
Thermal Foldback
The ICs feature thermal foldback that helps prevent
unwanted thermal-shutdown events. If activated, ther-
mal foldback attenuates the stereo output signal once
the internal junction temperature exceeds +130NC.
Attenuation is applied proportionally as the junction tem-
perature (TJ) exceeds the fixed +130NC threshold. The
thermal-foldback mode is controlled by the TEMPLOCK
pin.
Overtemperature Protection
The ICs feature an overtemperature protection that dis-
ables the amplifier if the junction temperature exceeds
+165NC. Once the amplifier is disabled and the die tem-
perature has cooled by 20NC, the devices enable again
and resume normal operation.
Overcurrent Protection
When the output current reaches the current limit, 5A
(typ), the ICs disable the outputs and initiate a recovering
sequence. The shutdown and recovering sequence is
repeated until the output fault is removed.
Applications Information
Filterless Class D Operation
Traditional Class D amplifiers require an output filter
to recover the audio signal from the amplifier’s output.
The filters add cost, increase the solution size of the
amplifier, and can decrease efficiency and THD+N
performance. The traditional PWM scheme uses large
differential output swings (2 x VDD peak-to-peak) and
causes large ripple currents. Any parasitic resistance in
the filter components results in a loss of power, lowering
the efficiency.
These ICs do not require an output filter. The devices
rely on the inherent inductance of the speaker coil and
the natural filtering of both the speaker and the human
ear to recover the audio component of the square-wave
output. Eliminating the output filter results in a smaller,
lower cost solution.
Because the frequency of the ICs’ output is well beyond
the bandwidth of most speakers, voice coil movement
due to the square-wave frequency is very small. For
optimum results, use a speaker with a series inductance
> 10FH. Typical 8I speakers exhibit series inductances
in the 20FH to 100FH range.
Table 2. Gain Selection
G1
G2
GAIN SETTING
(dB)
GND
9
Unconnected
GND
13
VS
GND
16.7
GND
Unconnected
20.1
Unconnected
23.3
VS
Unconnected
26.4
GND
VS
29.8
Unconnected
VS
32.9
VS
Reserved
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX98400BEVKIT+ | 功能描述:放大器 IC 開發(fā)工具 MAX98400B Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| MAX98400ETX+ | 制造商:Maxim Integrated Products 功能描述:STEREO CLASS D AMPLIFIER - Rail/Tube |
| MAX98400EVKIT+ | 制造商:Maxim Integrated Products 功能描述:STEREO 6W HIGH POWER CLASS D AMPLIFIER - Boxed Product (Development Kits) |
| MAX9840AEWL+T | 制造商:Maxim Integrated Products 功能描述:MONO 2W CLASS D AMPLIFIER - Tape and Reel |
| MAX984CPE | 功能描述:校驗器 IC 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(bǔ)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 |
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