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TDA7269SA Datasheet, PDF (5/11 Pages) STMicroelectronics – 10W+10W STEREO AMPLIFIER WITH MUTE & ST-BY | |||
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Figure 6. Test and Application Circuit (Stereo Configuration)
+VS
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
+VS
3
+
4 OUT (L)
-
R5
R7
8 IN- (L)
C8
R6
10 IN- (R)
R9
R8
-
2 OUT (R)
+
R10
1
6
-VS
C9
C7
C6
TDA7269SA
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
10Kâ¦
Mute Circuit
R2
R3
R4
R5, R8
R6, R9
R7, R10
C1, C2
C3
C4, C6
C5, C7
C8, C9
Dz
15Kâ¦
18Kâ¦
15Kâ¦
18Kâ¦
560â¦
4.7â¦
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
Vpin #5 Shifted Downward Vpin #5 Shifted Upward
Vpin #5 Shifted Upward
Vpin #5 Shifted Downward
Vpin #5 Shifted Upward
Vpin #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 â¥25dB
5/11
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