TDA7265 Datasheet, PDF (8/11 Pages) STMicroelectronics – 25 +25W STEREO AMPLIFIER WITH MUTE & ST-BY

TDA7265
APPLICATIONS SUGGESTION
(Demo Board Schematic)
The recommended values of the external compo-
nents are those shown are 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 # 5 Shifted Downward Vpin # 5 Shifted Upward
R3
18KΩ
Mute Circuit
Vpin # 5 Shifted Upward
Vpin # 5 Shifted Downward
R4
15KΩ
Mute Circuit
Vpin # 5 Shifted Upward
Vpin # 5 Shifted Downward
R5, R8
R6, R9
18KΩ
560Ω
Closed Loop Gain
Setting (*)
Increase of Gain
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 Voltage
Bypass
Danger of Oscillations
C5, C7
0.1µF
Supply Voltage
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
MUTE, STAND-BY TRUTH TABLE
SW1
B
B
A
A
SW2
A
B
A
B
STAND-BY
STAND-BY
MUTE
PLAY
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