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參數資料
| 型號： | MUB08A |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 運動控制電子 |
| 英文描述： | 1W, Bypass-Capacitor-less Audio Amplifier with Internal Selectable Gain |
| 中文描述： | 1W的，旁路電容器的音頻，內置可選增益放大器 |
| 文件頁數： | 10/15頁 |
| 文件大小： | 468K |
| 代理商： | MUB08A |
Application Information
(Continued)
C
i.
A larger input coupling capacitor requires more charge to
reach its quiescent DC voltage (nominally 1/2 V
DD
). This
charge comes from the output via the feedback and is apt to
create pops upon device enable. Thus, by minimizing the
capacitor size based on necessary low frequency response,
turn-on pops can be minimized.
AUDIO POWER AMPLIFIER DESIGN
A 1W/8
Audio Amplifier
Given:
Power Output
Load Impedance
Input Level
Input Impedance
Bandwidth
1 Wrms
8
1 Vrms
20 k
100 Hz–20 kHz
±
0.25 dB
A designer must first determine the minimum supply rail to
obtain the specified output power. By extrapolating from the
Output Power vs Supply Voltage graphs in the
Typical Per-
formance Characteristics
section, the supply rail can be
easily found.
Extra supply voltage creates headroom that allows the
LM4906 to reproduce peaks in excess of 1W without pro-
ducing audible distortion. At this time, the designer must
make sure that the power supply choice along with the
output impedance does not violate the conditions explained
in the
Power Dissipation
section.
The gain of the LM4906 is internally set at either 6dB or
12dB.
The final design step is to address the bandwidth require-
ments which must be stated as a pair of 3dB frequency
points. Five times away from a 3dB point is 0.17dB down
from passband response which is better than the required
±
0.25dB specified.
f
L
= 100Hz / 5 = 20Hz
f
H
= 20kHz * 5 = 100kHz
As stated in the
External Components
section, R
in
(20k) in
conjunction with C
2
create a highpass filter.
C
2
≥
1 / (2
π
*20k
*20Hz) = 0.397μF; use 0.39μF
200571C0
FIGURE 2. REFERENCE DESIGN BOARD SCHEMATIC
L
www.national.com
10
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