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TDA7245 データシートの表示(PDF) - STMicroelectronics
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TDA7245
5W AUDIO AMPLIFIER WITH MUTING AND STAND-BY
STMicroelectronics
TDA7245 Datasheet PDF : 11 Pages
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Figure 3:
P.C. Board and Components Layout of the Circuit of fig 2 (1:1 scale)
TDA7245
APPLICATION SUGGESTIONS
The recommended values of the external components are those shown on the application circuit of fig.1.
Different values can be used. The following table can help the dsigner.
Component Rec. Value
R1
20K
Ω
R2(*)
R3(*)
R4
C1
27K
Ω
270
Ω
1
Ω
22
µ
F
C2
47
µ
F
C3
0.1
µ
F
C4
2.2
µ
F
C5
470
µ
F
C6
0.22
µ
F
C7
1000
µ
F
Purpose
St-By Biasing
Feedback
Resistors
Frequency Stability
St-By Capacitor
SVR Capacitor
Input Capacitance
Inverting Input DC
Decoupling
Supply Voltage
Frequency Stability
Output DC Decoupling
Larger than Rec. Value
Incorrect St-By Function
Increase of Gain
Decrease of Gain
Danger of Oscillations
Longer ON/OFF Delay
Time at St-By IN/OUT
Worse Turn-On POP by
V
S
and St-By
Danger of Oscillations
Smaller than Rec. Value
Worse POP and Shorter
Delay at St-By Insertion
Decrease of Gain
Increase of Gain
Worse POP and Shorter
Delay at St-By insertion
Degradation of SVR
Higher Low Frequency
Cut-off
Higher Low Frequency
Cut-off
Danger of Oscillations
Higher Low Frequency
Cut-off
(*) The value of closed loop gain (G
V
= 1 + R2/R3) must be higher than 25dB.
5/11
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