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

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

Figure 3: P.C. Board and Components Layout of the Circuit of fig 2 (1:1 scale)

TDA7245

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