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參數(shù)資料
| 型號： | MAX4295 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers |
| 中文描述： | 單聲道/立體聲、2W、開關模式(D類)音頻功率放大器 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大小： | 719K |
| 代理商： | MAX4295 |
M
Mono/Stereo 2W Switch-Mode (Class-D)
Audio Power Amplifiers
______________________________________________________________________________________
11
H-bridge. The switches work in pairs to reverse the
polarity of the signal 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.
FS1 and FS2 program the oscillator to a frequency of
125kHz, 250kHz, 500kHz, and 1MHz. The sawtooth
oscillator swings between GND and 0.6
V
CC
. The
input signal is typically AC-coupled to the internal input
op amp, whose gain can be controlled through external
feedback components. The common-mode voltage of
the input amplifier is 0.3
V
CC
and is internally gener-
ated from the same resistive divider used to generate
the 0.6
V
CC
reference for the PWM oscillator.
Current Limit
A current-limiting circuit in the H-bridge monitors the
current in the H-bridge transistors and disables the H-
bridge if the current in any of the H-bridge transistors
exceeds 1A. The H-bridge is enabled after a period of
100μs. A continuous short circuit at the output results in
a pulsating output.
Thermal Overload Protection
Thermal overload protection limits total power dissipa-
tion in the MAX4295/MAX4297. When the junction tem-
perature exceeds +145
°
C, the thermal detection
disables the H-bridge transistors. The H-bridge transis-
tors are enabled after the IC
’
s junction temperature
cools by 10
°
C. This results in a pulsating output under
continuous thermal overload conditions. Junction tem-
perature does not exceed the thermal overload trip
point in normal operation, but only in the event of fault
conditions, such as when the H-bridge outputs are
short circuited.
Undervoltage Lockout
At low supply voltages, the MOSFETs in the H-bridge
may have inadequate gate drive thus dissipating
excessive power. The undervoltage lockout circuit pre-
vents the device from operating at supply voltages
below +2.2V.
GATE
DRIVE
PV
CC
OUT-
PGND
POWER MANAGEMENT
AND PROTECTION
PWM
OSC
SS
CSS
FS1
FS2
0.3
V
CC
(VCM)
IN
AOUT
V
CC
GND
OUT+
GATE
DRIVE
PV
CC
PGND
Figure 1a. MAX4295 Functional Diagram
相關PDF資料 |
PDF描述 |
|---|---|
| MAX4295EEE | Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers |
| MAX4295ESE | Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers |
| MAX4297 | Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers |
| MAX4297EAG | Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers |
| MAX4321 | Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4295EEE | 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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