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參數(shù)資料
| 型號： | MAX4295EEE+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 14/15頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO PWR 2W MONO 16QSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 類型： | D 類 |
| 輸出類型： | 1-通道（單聲道） |
| 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： | 2W x 1 @ 4 歐姆 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 特點(diǎn)： | 消除爆音，短路保護(hù)和熱保護(hù)，關(guān)閉 |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 16-QSOP |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 包裝： | 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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4295EEE+ | 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 |
| MAX4295EEE+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 |
| MAX4295EEE-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 |
| MAX4295ESE | 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 |
| 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 |
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