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参数资料
| 型号： | MAX98400BEVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/26页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX98400B |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | * |
Stereo, High-Power, Class D Amplifiers
MAX98400A/MAX98400B
16
The MAX98400A/MAX98400B are available in 36-pin
and 24-pin TQFN packages, respectively, and are
specified over the -40NC to +85NC temperature range.
Efficiency
The high efficiency of a Class D amplifier is due to the
switching operation of the output stage transistors. In a
Class D amplifier, the output transistors act as switches
and consume negligible power. Power loss associated
with the Class D output stage is due to the I2R loss of the
MOSFET on-resistance, various switching losses, and
quiescent current overhead.
The theoretical best efficiency of a linear amplifier is 78%
at peak output power. Under typical music reproduction
levels, the efficiency falls below 30%, whereas these
ICs exhibit > 85% efficiency under the same conditions
(Figure 2).
Shutdown
The ICs feature a shutdown mode that reduces power
consumption and extends battery life in portable appli-
cations. The shutdown mode reduces supply current to
8FA (typ). Drive SHDN high for normal operation. Drive
SHDN low to place the device in low-power shutdown
mode. In shutdown mode, the outputs are high imped-
ance and the common-mode voltage at the output
decays to zero. The shutdown mode serves as a mute
function.
Click-and-Pop Suppression
The ICs feature comprehensive click-and-pop suppres-
sion that minimizes audible transients on startup and
shutdown. While in shutdown, the H-bridge is in a high-
impedance state.
Mono Configuration
The MAX98400A features a mono mode that allows the
right and left channels to operate in parallel, achieving
up to 40W of output power. Apply a logic-high (VS) to
MONO to enable mono mode. In mono mode, an audio
signal applied to the left channel (INL) is routed to the
H-bridges of both channels. Connect OUTL+ to OUTR+
and OUTL- to OUTR- using heavy PCB traces as close
as possible to the device. Driving MONO low (stereo
mode) while the outputs are wired together in mono
mode can trigger the short-circuit or thermal-overload
protection, or both.
Clipping Limiter
The ICs feature a programmable clipping limiter to pre-
vent output clipping distortion and excessive power dis-
sipation and to protect small speakers. All limiter func-
tionality is controlled by two pins: LIM_TH and RELEASE.
The voltage applied at the LIM_TH pin controls the
threshold when the limiter acts, and the capacitor at the
RELEASE pin controls the release time of the limiter. The
limiter controls both left and right channels together.
Figure 1. MAX98400B EMI Performance
Figure 2. MAX98400A Efficiency vs. Class AB Efficiency
FREQUENCY (MHz)
AMPLITUDE
(dBV/m)
0
10
20
30
40
-10
100
30
1000
EFFICIENCY vs. OUTPUT POWER
TOTAL OUTPUT POWER (W)
EFFICIENCY
(%)
15
10
5
10
20
30
40
50
60
70
80
90
100
0
20
MAX98400A
CLASS AB
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX98400BEVKIT+ | 功能描述:放大器 IC 开发工具 MAX98400B Eval Kit RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX98400ETX+ | 制造商:Maxim Integrated Products 功能描述:STEREO CLASS D AMPLIFIER - Rail/Tube |
| MAX98400EVKIT+ | 制造商:Maxim Integrated Products 功能描述:STEREO 6W HIGH POWER CLASS D AMPLIFIER - Boxed Product (Development Kits) |
| MAX9840AEWL+T | 制造商:Maxim Integrated Products 功能描述:MONO 2W CLASS D AMPLIFIER - Tape and Reel |
| MAX984CPE | 功能描述:校验器 IC RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
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