- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384715 > MAX9759 (Maxim Integrated Products, Inc.) 3.2W, High-Efficiency, Low-EMI, Filterless, Class D Audio Amplifier PDF資料下載
參數(shù)資料
| 型號(hào)： | MAX9759 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 3.2W, High-Efficiency, Low-EMI, Filterless, Class D Audio Amplifier |
| 中文描述： | 3.2W、高效、低EMI、無需濾波、D類音頻放大器 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 957K |
| 代理商： | MAX9759 |
M
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 (0.1μA)
shutdown mode. Drive
SHDN
high for normal operation.
Idle Mode is a trademark of Maxim Integrated Products, Inc.
30
60
80
100
120
140
160
180
280
300
220
200
240
260
15
20
25
30
35
40
45
50
A
μ
V
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
OUTPUT POWER (W)
0.8
1.2
0.6
1.0
EFFICIENCY vs. OUTPUT POWER
E
V
DD
= 5V
f = 1kHz
R
L
= 8
CLASS AB
MAX9759
Figure 5. MAX9759 Efficiency vs. Output Power
G2
0
0
1
1
G1
0
1
0
1
GAIN (dB)
+24
+18
+12
+6
Table 2. Gain Selection
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX975ESA | Octal Transparent D-type Latches With 3-State Outputs 20-LCCC -55 to 125 |
| MAX975-MAX977 | Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby |
| MAX977 | Octal Edge-Triggered D-type Flip-Flops With 3-State Outputs 20-LCCC -55 to 125 |
| MAX977EEE | Octal Edge-Triggered D-type Flip-Flops With 3-State Outputs 20-CFP -55 to 125 |
| MAX977ESD | Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9759ETE+ | 功能描述:音頻放大器 3.2W Low-EMI Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9759ETE+T | 功能描述:音頻放大器 3.2W Low-EMI Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| 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:音頻放大器 Evaluation Kit for the MAX9759 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。