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参数资料
| 型号： | MAX9742ETX+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/36页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 20.5W D 36TQFN |
| 标准包装： | 50 |
| 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： | 20.5W x 2 @ 8 欧姆 |
| 电源电压： | 20 V ~ 40 V，±10 V ~ 20 V |
| 特点： | 消除爆音，差分输入，静音，短路和热保护，关机 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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MAX9742
To maximize the performance of the differential output
filter and minimize EMI radiation, keep the ground con-
nections of the CF capacitors close together on the
PCB and place the filter near the MAX9742.
The component ratings for CF and LF follow the same
requirements mentioned in the
Single-Ended LC Output
Filter Design (LF and CF) section.
Zobel Network
For speaker loads that have appreciable amounts of
voice coil inductance (> 33H), peaking in the frequen-
cy response of the output may occur near the cutoff fre-
quency of the LC filter, which may cause the device to
go into current limit at high output powers. This peaking
is due to the resonant circuit formed by the LC output
filter and complex impedance of the speaker. To nullify
the peaking in the frequency response, connect a
Zobel network (series RC circuit) in parallel with the
speaker load as shown in Figure 10. The Zobel circuit
reduces the peaking by dampening the reactive behav-
ior of the speaker. For the single-ended output configu-
ration, use the following equations to calculate the
component values for the Zobel network:
where RZBL is the value of the Zobel resistor, CZBL is
the value of the Zobel capacitor, RSPKR is the DC resis-
tance of the speaker, and fC is the cutoff frequency of
the LC filter. For the BTL configuration, use half of the
BTL resistance for the Zobel network calculations.
Connect a ground-terminated Zobel network on each
side of the BTL resistance to prevent excessive peak-
ing in the common-mode response of the output filter.
For most applications, RZBL should have a minimum
power rating of 1/4W or greater. CZBL should have a
voltage rating greater than or equal to VDD.
R
1.2
R
C
1
2R
f
ZBL
SPKR
ZBL
SPKR
C
=×
=
××
()
π
F
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
22
______________________________________________________________________________________
Table 3. Recommended Differential LC
Filter Component Values for an 8 BTL
Speaker Load (fC = 40kHz)
DC Resistance of Speaker (
)LF (H)
CF (F)
8
22
0.68
LF
CF
OUTL
LF
OUTR
RSPKR
BRIDGE-TIED-LOAD (BTL) OUTPUT FILTER
Figure 9. BTL LC Output Filter
LF
CF
OUTL
LF
OUTR
RSPKR
NOTE: AN OUTPUT-COUPLING CAPACITOR (COUT) IS NEEDED FOR SINGLE-SUPPLY,
SINGLE-ENDED OUTPUT CONFIGURATION.
SPEAKER
LOAD
LSPKR
RZBL
CZBL
LF
CF
OUT_
RSPKR
SPEAKER
LOAD
LSPKR
RZBL
CZBL
Figure 10. Zobel Network Connections for High-Inductance
Speakers
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9742ETX+ | 功能描述:音频放大器 Stereo 16W Class D Amplifier 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 |
| MAX9742ETX+T | 功能描述:音频放大器 Stereo 16W Class D Amplifier 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 |
| MAX9742EVKIT+ | 功能描述:音频放大器 Evaluation Kit for the MAX9742 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 |
| MAX9744ETH+ | 功能描述:音频放大器 Stereo 20W Class D Amplifier 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 |
| MAX9744ETH+T | 功能描述:音频放大器 Stereo 20W Class D Amplifier 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 |
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