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参数资料
| 型号： | MAX9759ETE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 3.2W D 16TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 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： | 4.3W x 1 @ 3 欧姆 |
| 电源电压： | 3 V ~ 5.5 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： | 16-TQFN-EP（4x4） |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
MAX9759
3.2W, High Efficiency, Low-EMI, Filterless,
Class D Audio Amplifier
______________________________________________________________________________________
13
sent at the input of the MAX9759, the outputs switch as
shown in Figure 4. Because the MAX9759 drives the
speaker differentially, the two outputs cancel each other,
resulting in no net Idle Mode voltage across the
speaker and minimal power consumption.
Efficiency
Efficiency of a Class D amplifier is mostly associated
with the region of operation of the output stage transis-
tors. In a Class D amplifier, the output transistors act as
current-steering switches and consume negligible addi-
tional power. Any power loss associated with the Class
D output stage is mostly due to the I x R loss of the
MOSFET on-resistance and quiescent current overhead.
The theoretical best efficiency of a linear amplifier is
78%; however, that efficiency is only exhibited at peak
output powers. Under normal operating levels (i.e., typi-
cal music reproduction levels), efficiency of a linear
amplifier can fall below 30%. The MAX9759 Class D
amplifier still exhibits >90% efficiencies under the same
conditions (Figure 5).
Gain Selection
The MAX9759 features an internally set, logic-selec-
table gain. The G1 and G2 logic inputs set the gain of
the MAX9759 speaker amplifier (Table 2).
Shutdown
The MAX9759 features a shutdown mode that reduces
power consumption and extends battery life. Driving
SHDN low places the MAX9759 in a low-power (0.1A)
shutdown mode. Drive SHDN high for normal operation.
30
60
80
100
120
140
160
180
280
300
220
200
240
260
15
20
25
30
35
40
45
50
AMPLITUDE
(dB
V/m)
FREQUENCY (MHz)
MAX9759
OUTPUT SPECTRUM
FCC LIMIT
Figure 3. MAX9759 EMI Spectrum
VIN = 0V
OUT-
OUT+
VOUT+ - VOUT- = 0V
Figure 4. MAX9759 Outputs with No Input Signal
0
30
20
10
50
40
90
80
70
60
100
0
0.2
0.4
0.8
1.2
0.6
1.0
EFFICIENCY vs. OUTPUT POWER
OUTPUT POWER (W)
EFFICIENCY
(%)
VDD = 5V
f = 1kHz
RL = 8
CLASS AB
MAX9759
Figure 5. MAX9759 Efficiency vs. Output Power
G2
G1
GAIN (dB)
00
+24
01
+18
10
+12
11
+6
Table 2. Gain Selection
Idle Mode is a trademark of Maxim Integrated Products, Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9759EUE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX9759EUE+T | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO 4.3W CLS-D 16TSSOP - Tape and Reel |
| MAX9759EVKIT | 功能描述:音频放大器 Evaluation Kit for the MAX9759 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 |
| MAX975ESA | 功能描述:校验器 IC 3V/5V Dual Speed Comparator 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 |
| MAX975ESA+ | 功能描述:校验器 IC 3V/5V Dual Speed Comparator 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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