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參數(shù)資料
| 型號： | HWD2119 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 350mWAudio Power Amplifier with Shutdown Mode |
| 中文描述： | 350mWAudio功率放大器關(guān)斷模式 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 877K |
| 代理商： | HWD2119 |
Application Information
(Continued)
HIGHER GAIN AUDIO AMPLIFIER
The
HWD
21
19 is unity-gain stable and requires no external
components besides gain-setting resistors, an input coupling
capacitor, and proper supply bypassing in the typical appli-
cation. However, if a closed-loop differential gain of greater
than 10 is required, a feedback capacitor (C
4
) may be
needed as shown in Figure 2 to bandwidth limit the amplifier.
This feedback capacitor creates a low pass filter that elimi-
nates possible high frequency oscillations. Care should be
taken when calculating the -3dB frequency in that an incor-
rect combination of R
3
and C
4
will cause rolloff before
20kHz. A typical combination of feedback resistor and ca-
pacitor that will not produce audio band high frequency rolloff
is R
3
= 20k
and C
4
= 25pF. These components result in a
-3dB point of approximately 320 kHz. It is not recommended
that the feedback resistor and capacitor be used to imple-
ment a band limiting filter below 100kHz.
Figure 2
12
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