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| 型号： | MAX98502EWE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/15页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUD 2.2W BOOST D 16WLP |
| 标准包装： | 2,500 |
| 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： | 4.1W x 1 @ 4 欧姆 |
| 电源电压： | 2.5 V ~ 5.5 V |
| 特点： | 消除爆音，差分输入，关闭 |
| 安装类型： | * |
| 供应商设备封装： | * |
| 封装/外壳： | * |
| 包装： | * |
10 _____________________________________________________________________________________
MAX98502
Boosted 2.2W Class D Amplifier
with Automatic Level Control
Detailed Description
The MAX98502 is a high-efficiency Class D audio ampli-
fier that features an integrated boost converter to deliver a
constant output power over a large range of battery supply
voltages. The boost converter operates at 2MHz, requiring
only a small (2.2FH) external inductor and output capaci-
tor. The amplifier has differential inputs and an internal fully
differential design with three gain settings (6dB, 15.5dB,
and 20dB) that are selectable with a logic input.
The MAX98502 also features automatic level control. The
automatic level control reduces the output swing when
the battery voltage decreases to prevent the collapse of
battery voltage.
Class D Speaker Amplifier
The MAX98502 filterless Class D amplifier offers much
higher efficiency than Class AB amplifiers. The high
efficiency of a Class D amplifier is due to the switching
operation of the output stage transistors. Any power loss
associated with the Class D output stage is mostly due to
the I2R loss of the MOSFET on-resistance and quiescent
current overhead.
Low-EMI Filterless Output Stage
Traditional Class D amplifiers require the use of external
LC filters, or shielding, to meet EN55022B electromag-
netic-interference (EMI) regulation standards. Maxim’s
active emissions limiting edge-rate control circuitry
reduces EMI emissions, while maintaining up to 92%
efficiency (speaker only). Above 10MHz, the wideband
spectrum looks like noise for EMI purposes.
Automatic Level Control
The MAX98502 features an automatic level control circuit
that limits the maximum speaker output swing. This helps:
U
Avoid clipping
U
Save the battery from collapsing, which could cause
a reset of the system
The limiter keeps the peak voltage below a value that is a
function of battery voltage, as shown in Figure 1.
The full output swing of 5.2V is maintained for battery
voltages down to the knee voltage, while for lower battery
voltages the maximum VPEAK-swing is reduced by 3V/V.
The knee voltage can be changed by applying different
resistors between RKNEE and AGND. The typical track-
ing function is shifted horizontally with different RKNEE
resistor values (Figure 2).
The preamplifier gain reduces as the automatic level
control activates. The maximum gain reduction is 8dB
with a resolution of 0.5dB steps.
The attack (gain reduction) happens immediately (20Fs/
dB), while the release is set to 1.6s/dB.
GAIN Select
The MAX98502 features three internal gain settings that
are selectable with the GAIN input. Table 1 shows the
gain settings.
Figure 1. Typical Tracking Function
Table 1. Gain Settings
Figure 2. The Relationship of RKNEE and VKNEE
PEAK AMPLIFIER OUTPUT VOLTAGE
vs. BATTERY VOLTAGE
BATTERY VOLTAGE (V)
PEAK
AMPLIFIER
OUTPUT
VOLTAGE
(V
PEAK
)
5
23
4
1
2
4
3
5
6
0
06
KNEE VOLTAGE
SLOPE
GAIN
AMPLIFIER GAIN (dB)
AGND
6
Unconnected
15.5
VBAT
20
VKNEE vs. RKNEE
RKNEE (kI)
V KNEE
(V)
60
50
40
30
20
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
2.9
10
70
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX98504EVKIT# | 制造商:Maxim Integrated Products 功能描述:KIT FOR CLASS D SPEAKER MAX98504 |
| MAX98504EWV+T | 制造商:Maxim Integrated Products 功能描述:BOOSTED CLASS D AMPLIFIER WITH I/V SENSE - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC AUDIO AMP CLASS D |
| MAX9850ETI | 制造商:Maxim Integrated Products 功能描述:STEREO AUDIO DAC WITH DIRECTDRIVE HEADPHONE A - Bulk |
| MAX9850ETI+ | 功能描述:音频数/模转换器 IC Stereo Audio DAC w/DirectDrive Amp RoHS:否 制造商:Texas Instruments 转换器数量: 分辨率:16 bit 接口类型:I2S, UBS 转换速率: 信噪比:98 dB 工作电源电压:5 V DAC 输出端数量:2 工作温度范围:- 25 C to + 85 C 电源电流:23 mA 安装风格:SMD/SMT 封装 / 箱体:TQFP-32 封装:Reel |
| MAX9850ETI+G47 | 功能描述:音频数/模转换器 IC Stereo Audio DAC w/DirectDrive Amp RoHS:否 制造商:Texas Instruments 转换器数量: 分辨率:16 bit 接口类型:I2S, UBS 转换速率: 信噪比:98 dB 工作电源电压:5 V DAC 输出端数量:2 工作温度范围:- 25 C to + 85 C 电源电流:23 mA 安装风格:SMD/SMT 封装 / 箱体:TQFP-32 封装:Reel |
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