參數(shù)資料
型號: MAX9742ETX+
廠商: Maxim Integrated Products
文件頁數(shù): 6/36頁
文件大小: 0K
描述: IC AMP AUDIO PWR 20.5W D 36TQFN
標準包裝: 50
類型: D 類
輸出類型: 2 通道(立體聲)
在某負載時最大輸出功率 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: 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: 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
14
______________________________________________________________________________________
efficiency of a linear amplifier is 78%; however, that effi-
ciency is only exhibited at peak output powers. Under
normal operating levels (typical music reproduction lev-
els), efficiency falls below 30%, whereas the MAX9742
still exhibits 80% efficiency under the same conditions.
Since the output transistors switch the output to either
VDD or VSS (ground for single-supply operation), the
resulting output of a Class D amplifier is a high-fre-
quency square wave. This square wave is pulse-width-
modulated by the audio input signal. In the MAX9742,
the pulse-width modulation (PWM) is accomplished by
comparing the input audio signal to an internally gener-
ated triangle wave oscillator. The resulting duty cycle of
the square wave is proportional to the level of the input
signal. When the input signal is at 0V, the duty cycle of
the MAX9742 output is equal to 50%. To extract the
amplified audio signal from this PWM waveform, the
output of the MAX9742 is fed to an external LC lowpass
filter (see the
Single-Ended LC Output Filter Design (LF
and CF) section). The LC filter works as an averaging
circuit for the PWM output voltage waveform. The
resulting averaged output voltage is equal to the ampli-
fied audio signal. Figure 3a illustrates the resulting
PWM output waveform due to the varying input signal
level, and Figure 3b shows the recovered amplified
input signal after filtering.
LF
CF
OUT_
VDD
VSS
DUAL-SUPPLY CONFIGURATION SHOWN
7V REGULATOR
(WITH RESPECT TO VSS)
GATE DRIVE LOGIC
CBOOT
0.1F
DBOOT
1N4148
REGLS
CREGLS
1F
VREGLS
NSENSE
(INTERNALLY
CONNECTED TO VSS)
MAX9742
Figure 2. Simplified Block Diagram of the MAX9742 Output Stage
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相關(guān)代理商/技術(shù)參數(shù)
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