TDA7269ASA Datasheet, PDF (5/11 Pages) STMicroelectronics – 14W+14W STEREO AMPLIFIER WITH MUTE & ST-BY

Figure 6. Test and Application Circuit (Stereo Configuration)
+V_S
R2
R1
Q1
SW1
ST-BY ^DZ
C3
MUTE/
ST-BY ₅
IN (L) 7
C1
R4
R3
SW2
MUTE
GND 9
C2
IN (R) 11
D94AU087B
C4
C5
+V_S
3
+
4 OUT (L)
-
R5
R7
8 IN- (L)
C8
R6
10 IN- (R)
R9
R8
-
2 OUT (R)
+
R10
1
6
-V_S
C9
C7
C6
TDA7269ASA
RL (L)
RL (R)
4 APPLICATION SUGGESTIONS
4.1 Demo Board Schematic
The recommended values of the external components are those shown the demoboard schematic different val-
ues can be used, the following table can help the designer
Table 5. .
COMPONENT
SUGGESTION
VALUE
PURPOSE
R1
10KΩ
Mute Circuit
R2
R3
R4
R5, R8
R6, R9
R7, R10
C1, C2
C3
C4, C6
C5, C7
C8, C9
Dz
15KΩ
18KΩ
15KΩ
18KΩ
560Ω
4.7Ω
1µF
1µF
1000µF
0.1µF
0.1µF
5.1V
Mute Circuit
Mute Circuit
Mute Circuit
Closed Loop Gain
Setting (*)
Frequency Stability
Input DC Decoupling
St-By/Mute Time
Constant
Supply Voltage Bypass
Supply Voltage Bypass
Frequency Stability
Mute Circuit
LARGER THAN
SMALLER THAN
RECOMMENDED VALUE RECOMMENDED VALUE
Increase of Dz Biasing
Current
V_pin #5 Shifted Downward V_pin #5 Shifted Upward
V_pin #5 Shifted Upward
V_pin #5 Shifted Downward
V_pin #5 Shifted Upward
V_pin #5 Shifted Downward
Increase of Gain
Decrease of Gain
Danger of Oscillations
Danger of Oscillations
Higher Low Frequency Cutoff
Larger On/Off Time
Smaller On/Off Time
Danger of Oscillations
Danger of Oscillations
(*) Closed loop gain has to be ≥25dB
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