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參數(shù)資料
| 型號： | MAX4295ESE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers |
| 中文描述： | 2 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| 封裝： | 0.150 INCH, MS-012AC, SOIC-16 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大小： | 719K |
| 代理商： | MAX4295ESE |
M
Mono/Stereo 2W Switch-Mode (Class-D)
Audio Power Amplifiers
10
______________________________________________________________________________________
Detailed Description
The MAX4295/MAX4297 switch-mode, Class-D audio
power amplifiers are intended for portable multimedia
and general-purpose audio applications. Linear ampli-
fiers in the 1W to 2W output range are inefficient; they
overheat when operated near rated output power lev-
els. The efficiency of linear amplifiers is <50% when the
output voltage is equal to 1/2 the supply. The
MAX4295/MAX4297 Class-D amplifiers achieve effi-
ciencies of 87% or greater and are capable of deliver-
ing up to 2W of continuous maximum power to a 4
load. The lost power is due mainly to the on-resistance
of the power switches and ripple current in the output.
In a Class-D amplifier, a PWM controller converts the
analog input to a variable pulse-width signal. The pulse
width is proportional to the input voltage, ideally 0% for
a 0V input signal and 100% for full-scale input voltages.
A passive lowpass LC network filters the PWM output
waveform to reconstruct the analog signal. The switch-
ing frequency is selected much higher than the maxi-
mum input frequencies so that intermodulation
products are outside the input signal bandwidth.
Higher switching frequencies also simplify the filtering
requirements.
The MAX4295/MAX4297 consist of an inverting input
operational amplifier, a PWM ramp oscillator, a con-
troller that converts the analog input to a variable pulse
width signal, and a MOSFET H-bridge power stage
(Figures 1a and 1b). The control signal is generated by
the PWM comparator; its pulse width is proportional to
the input voltage. Ideally the pulse width varies linearly
between 0% for a 0V input signal and 100% for full-
scale input voltages (Figure 2). This signal controls the
Pin Description
PIN
MAX4295
MAX4297
NAME
FUNCTION
1, 12
2, 15
3
—
—
4, 13
5
10
GND
PV
CC
OUT+
OUT+L
OUT+R
PGND
V
CC
Analog Ground
H-Bridge Power Supply
Positive H-Bridge Output
Positive Left-Channel H-Bridge Output
Positive Right-Channel H-Bridge Output
Power Ground
Analog Power Supply
4, 9, 16, 21
—
5
8
6, 7, 18, 19
3, 23
6
13
VCM
Audio Input Common-Mode Voltage. Do not connect. Minimize parasitic
coupling to this pin.
7
—
—
8
—
—
—
2
11
—
1
12
IN
INL
INR
AOUT
AOUTL
AOUTR
Audio Input
Left-Channel Audio Input
Right-Channel Audio Input
Input Amplifier Output
Left-Channel Input Amplifier Output
Right-Channel Input Amplifier Output
9
22
SHDN
Active-Low Shutdown Input. Connect to V
CC
for normal operation. Do not
leave floating.
10
11
14
—
—
16
14
15
—
20
17
24
FS1
FS2
OUT-
OUT-L
OUT-R
SS
Frequency Select Input 1
Frequency Select Input 2
Negative H-Bridge Output
Negative Left-Channel H-Bridge Output
Negative Right-Channel H-Bridge Output
Soft-Start
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4295ESE+ | 功能描述:音頻放大器 Mono 2W Switch Mode (Class D) 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 |
| MAX4295ESE+T | 功能描述:音頻放大器 Mono 2W Switch Mode (Class D) 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 |
| MAX4295ESE-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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX4295EVKIT | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT FOR THE MAX4295 - Bulk |
| MAX4297EAG | 功能描述:音頻放大器 Integrated Circuits (ICs) 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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