TDA7261 Datasheet, PDF (4/9 Pages) STMicroelectronics – 25W MONO AMPLIFIER WITH MUTE/ST-BY

TDA7261
APPLICATIONS SUGGESTION
(Demo Board Schematic)
The recommended values of the external compo-
nents are those shown on the demo board sche-
matic. Different values can be used: the following
table can help the designer.
COMPONENTS
RECOMMENDED
VALUE
PURPOSE
LARGER THAN
SMALLER THAN
RECOMMENDED VALUE RECOMMENDED VALUE
R1
10KΩ
Mute Circuit
Increase of Dz
Biasing Current
R2
15KΩ
Mute Circuit
Vpin # 4 Shifted Downward Vpin # 4 Shifted Upward
R3
18KΩ
Mute Circuit
Vpin # 4 Shifted Upward
Vpin # 4 Shifted Downward
R4
15KΩ
Mute Circuit
Vpin # 4 Shifted Upward
Vpin # 4 Shifted Downward
R5
4.7Ω
Frequency Stability Danger of Oscillations
Danger of Oscillations
C1
1µF
Input DC
Decoupling
Higher Low Frequency
Cutoff
C2
1µF
St-By/Mute Time
Constant
Larger On/Off Time
Smaller On/Of Time
C3, C5
1000µF
Supply Voltage
Bypass
Danger of Oscillations
C4, C6
0.1µF
Supply Voltage
Bypass
Danger of Oscillations
C7
0.1µF
Frequency Stability
Dz
5.1V
Mute Circuit
Q1
BC107
Mute Circuit
MUTE, STAND-BY TRUTH TABLE
SW1
A
A
B
B
SW2
A
B
B
A
STAND-BY
STAND-BY
MUTE
PLAY
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