TDA7269A_03 Datasheet, PDF (5/9 Pages) STMicroelectronics – 14W+14W STEREO AMPLIFIER WITH MUTE & ST-BY

Figure 4. Test and Application Circuit (Stereo Configuration)
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
+V_S
+V_S
3
C4
C5
+
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
TDA7269A
RL (L)
RL (R)
APPLICATION SUGGESTIONS (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.
COMPONENT
SUGGESTION
VALUE
PURPOSE
LARGER THAN
SMALLER THAN
RECOMMENDED VALUE RECOMMENDED VALUE
R1
10KΩ
Mute Circuit
Increase of Dz Biasing
Current
R2
15KΩ
Mute Circuit
V_pin #5 Shifted Downward V_pin #5 Shifted Upward
R3
18KΩ
Mute Circuit
V_pin #5 Shifted Upward
V_pin #5 Shifted Downward
R4
15KΩ
Mute Circuit
V_pin #5 Shifted Upward
V_pin #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
Larger On/Off Time
Smaller On/Off Time
Constant
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
(*) Closed loop gain has to be ≥25dB
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