TDA2050

Split-supply application suggestions

Doc ID 1461 Rev 3

5/18

2

Split-supply application suggestions

The recommended values of the external components are those shown on the application

circuit of Figure 5. Different values can be used. The following table can help the designer.

Table 5.

Recommended values of external components

Component

Recommended

value

Purpose

Larger than

recommended value

Smaller than

recommended value

R1

22 k

Ω

Input impedance

Increase of input

impedance

Decrease of Input

Impedance

R2

680

Ω

Feedback resistor

1.

The gain must be higher than 24 dB

Increase of gain

R3

22 k

Ω

Increase of gain

Decrease of gain(1)

R4

2.2

Ω

Frequency stability

Danger of oscillations

C1

1 µF

Input decoupling DC

Higher low-frequency cutoff

C2

22 µF

Inverting input DC

decoupling

Increase of switch

ON/OFF noise

Higher low-frequency cutoff

C3, C4

100 nF

Supply voltage bypass

Danger of oscillation

C5, C6

220 µF

Supply voltage bypass

Danger of oscillation

C7

0.47 µF

Frequency stability

Danger of oscillation