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TDA7245 Folha de dados(PDF) 5 Page - STMicroelectronics |
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TDA7245 Folha de dados(HTML) 5 Page - STMicroelectronics |
5 / 11 page 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 Ω St-By Biasing Incorrect St-By Function Worse POP and Shorter Delay at St-By Insertion R2(*) 27K Ω Feedback Resistors Increase of Gain Decrease of Gain R3(*) 270 Ω Decrease of Gain Increase of Gain R4 1 Ω 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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Descrição semelhante - TDA7245 |
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