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参数资料
| 型号： | MAX9744ETH+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 22.5W D 44TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | D 类 |
| 输出类型： | 2 通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 22.5W x 2 @ 4 欧姆 |
| 电源电压： | 4.5 V ~ 14 V |
| 特点： | 消除爆音，静音，短路和热保护，关机，音量控制 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 44-TQFN-EP（7x7） |
| 封装/外壳： | 44-WFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | MAX9744ETH+TDKR |
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MAX9744
Applications Information
Filterless Class D Operation
The MAX9744 meets common EMC radiation limits with-
out a filter when the speaker leads are less than approxi-
mately 10cm. Using lengths beyond 10cm is possible
verifying against the appropriate EMC standard.
For longer speaker wire lengths, up to approximately
1m, use a simple ferrite bead and capacitor filter to
meet EMC limits. Select a ferrite bead with 100
Ω to
600
Ω impedance, and rated for at least 3A. The capaci-
tor value varies based on the ferrite bead chosen and
the actual speaker lead length. Select the capacitor
value based on EMC performance. See Figure 7 for the
correct connections of these components.
When evaluating the device without a filter or a ferrite
bead filter, include a series inductor (68H for 8
Ω load
and 33H for 4
Ω load) to model the actual loudspeak-
er’s behavior. Omitting this inductor reduces the effi-
ciency, the THD+N performance, and the output power
of the MAX9744.
Inductor-Based Output Filters
Some applications use the MAX9744 with a full induc-
tor/capacitor-based (LC) output filter. This is common
for longer speaker lead lengths and to gain increased
margin to EMC limits. Select the PWM output mode and
use fixed-frequency modulation mode for best audio
performance. See Figure 8 for the correct connections
of these components.
The component selection is based on the load imped-
ance of the speaker. Table 8 lists suggested values for
a variety of load impedances.
Inductors L1 and L2 and capacitor C1 form the primary
output filter. In addition to these primary filter compo-
nents, other components in the filter improve its func-
tionality. Capacitors C4 and C5 plus resistors R1 and
R2 form a Zobel at the output. A Zobel corrects the out-
put loading to compensate for the rising impedance of
the loudspeaker. Without a Zobel, the filter has a peak
in its response near the cutoff frequency. Capacitors
C2 and C3 provide common-mode noise suppression
to reduce radiated emissions.
20W Stereo Class D Speaker Amplifier
with Volume Control
______________________________________________________________________________________
21
RL (
Ω)
L1, L2
(H)
C1 (F)
C2, C3
(F)
R1, R2
(
Ω)
C4, C5
(F)
4
10
0.47
10
0.47
6
15
0.33
0.22
15
0.33
8
22
0.22
22
0.22
Table 8. Suggested Values for LC filter
BOOT_+
CBOOT
0.1
μF
CFILT
470pF
CFILT
470pF
OUT_+
BOOT_-
CBOOT
0.1
μF
OUT_-
MAX9744
Figure 7. Ferrite Bead Filter
BOOT+
CBOOT
0.1
μF
OUT+
L1
4
1, 2
C2
C1
R1
MAX9744
C4
L2
14, 18
15
BOOT-
CBOOT
0.1
μF
OUT-
C3
R2
RL
C5
Figure 8. Output Filter for PWM Mode
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9744EVCMAXQU+ | 功能描述:音频放大器 Evaluation Kit/Evaluation System for the MAX9744 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 |
| MAX9744EVKIT+ | 功能描述:音频放大器 Evaluation Kit/Evaluation System for the MAX9744 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 |
| MAX974CPE | 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 |
| MAX974CPE+ | 功能描述:校验器 IC Dual Comparator / Reference 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 |
| MAX974CSE | 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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