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| 型号： | MAX4295EEE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/15页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 2W MONO 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | D 类 |
| 输出类型： | 1-通道（单声道） |
| 在某负载时最大输出功率 x 通道数量： | 2W x 1 @ 4 欧姆 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 特点： | 消除爆音，短路保护和热保护，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 16-QSOP |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
MAX4295
Mono, 2W, Switch-Mode (Class D)
Audio Power Amplifier
8
_______________________________________________________________________________________
GATE
DRIVE
PVCC
OUT-
PGND
POWER MANAGEMENT
AND PROTECTION
PWM
OSC
SS
CSS
FS1
FS2
0.3
VCC
(VCM)
IN
AOUT
VCC
GND
OUT+
GATE
DRIVE
PVCC
PGND
MAX4295
Figure 1. Functional Diagram
Detailed Description
The MAX4295 switch-mode, Class D audio power
amplifier is intended for portable multimedia and gener-
al-purpose audio applications. Linear amplifiers in the
1W to 2W output range are inefficient; they overheat
when operated near rated output power levels. The effi-
ciency of linear amplifiers is <50% when the output
voltage is equal to 1/2 the supply. The MAX4295 Class
D amplifier achieves efficiencies of 87% or greater and
is capable of delivering up to 2W of continuous maxi-
mum 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 consists of an inverting input operational
amplifier, a PWM ramp oscillator, a controller that con-
verts the analog input to a variable pulse-width signal,
and a MOSFET H-bridge power stage (Figure 1). 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 H-bridge. The
switches work in pairs to reverse the polarity of the sig-
nal in the load. Break-before-make switching of the H-
bridge MOSFETs by the driver circuit keeps supply
current glitches and crowbar current in the MOSFETs at
a low level. The output swing of the H-bridge is a direct
function of the supply voltage. Varying the oscillator
swing in proportion to the supply voltage maintains
constant gain with varying supply voltage.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4295EEE+ | 功能描述:音频放大器 Mono 2W Switch Mode (Class D) RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX4295EEE+T | 功能描述:音频放大器 Mono 2W Switch Mode (Class D) RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX4295EEE-T | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX4295ESE | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX4295ESE+ | 功能描述:音频放大器 Mono 2W Switch Mode (Class D) RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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