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TDA7245 データシート(PDF) 5 Page - STMicroelectronics

部品番号 TDA7245
部品情報  5W AUDIO AMPLIFIER WITH MUTING AND STAND-BY
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7245 データシート(HTML) 5 Page - STMicroelectronics

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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
Purpose
Larger than Rec. Value
Smaller than Rec. Value
R1
20K
St-By Biasing
Incorrect St-By Function
Worse POP and Shorter
Delay at St-By Insertion
R2(*)
27K
Feedback
Resistors
Increase of Gain
Decrease of Gain
R3(*)
270
Decrease of Gain
Increase of Gain
R4
1
Frequency Stability
Danger of Oscillations
C1
22
µF
St-By Capacitor
Longer ON/OFF Delay
Time at St-By IN/OUT
Worse POP and Shorter
Delay at St-By insertion
C2
47
µF
SVR Capacitor
Worse Turn-On POP by
VS and St-By
Degradation of SVR
C3
0.1
µF
Input Capacitance
Higher Low Frequency
Cut-off
C4
2.2
µF
Inverting Input DC
Decoupling
Higher Low Frequency
Cut-off
C5
470
µF
Supply Voltage
Danger of Oscillations
C6
0.22
µF
Frequency Stability
Danger of Oscillations
C7
1000
µF
Output DC Decoupling
Higher Low Frequency
Cut-off
(*) The value of closed loop gain (GV = 1 + R2/R3) must be higher than 25dB.
Figure 3: P.C. Board and Components Layout of the Circuit of fig 2 (1:1 scale)
TDA7245
5/11


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