SA7267 Datasheet, PDF (9/10 Pages) Silan Microelectronics Joint-stock – 2CH AUDIO POWER AMPLIFIER(20W X 2)

SA7267
APPLICATION SUGGEST
The recommended values of the external components shown are the Typical Application Circuit in Split
Supply:
RECOMMENDED
COMPONENTS
VALUE
PURPOSE
LARGER THAN
RECOMMENDED
VALUE
SMALLER THAN
RECOMMENDED
VALUE
Increase of Dz
R1
10KΩ
Mute Circuit
Biasing Current
VMUTE/STBY Shifted VMUTE/STBY Shifted
R2
15KΩ
Mute Circuit
Downward
Upward
VMUTE/STBY Shifted VMUTE/STBY Shifted
R3
18KΩ
Mute Circuit
Upward
Downward
VMUTE/STBY Shifted VMUTE/STBY Shifted
R4
15KΩ
Mute Circuit
Upward
Downward
R5, R8
18KΩ
Closed Loop Gain Increase of Gain
R6, R9
560Ω
Setting*
Decrease of Gain
R7, R10
4.7Ω
Frequency
Stability
Danger of Oscillations Danger of Oscillations
C1, C2
1µF
Input DC
Decoupling
Higher Low Frequency
Cutoff
C3
1µF
St-By/Mute Time
Constant
Larger On/Off Time
Smaller On/Off Time
C4, C6
1000µF
Supply Bypass
Danger of Oscillations
C5, C7
0.1µF
Supply Bypass
Danger of Oscillations
C8, C9
0.1µF
Frequency
Stability
Dz
5.1V
Mute Circuit
Q1
BC107
Mute Circuit
* Closed loop gain has to be • 25dB.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1 2006.05.25
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