TDA2050

Single-supply application suggestions

Doc ID 1461 Rev 3

7/18

3

Single-supply application suggestions

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

circuit of Figure 6. Different values can be used. The following table can help the designer.

Table 6.

Recommonded values

Note:

If the supply voltage is lower than 40 V and the load is 8 ohm (or more), a lower value of C2

can be used (i.e. 22 mF). C7 can be larger than 1000 µF only if the supply voltage does not

exceed 40 V.

Component

Recommended

value

Purpose

Larger than

recommended value

Smaller than

recommended value

R1, R2, R3

22 k

Ω

Biasing resistor

R4

680

Ω

Feedback resistor

Increase of gain

1.

The gain must be higher than 24 dB

R5

22 k

Ω

Decrease of gain(1)

Increase of gain

R6

2.2

Ω

Frequency stability

Danger of oscillations

C1

2.2 µF

Input decoupling DC

Higher low-frequency cutoff

C2

100 µF

Supply voltage rejection

Worse turn-off transient

Worse turn-on delay

C3

1000 µF

Supply voltage bypass

Danger of oscillations

Worse turn-off transient

C4

22 µF

Inverting input DC

decoupling

Increase of switching

ON/OFF

Higher low-frequency cutoff

C5

100 nF

Supply voltage bypass

Danger of oscillations

C6

0.47 µF

Frequency stability

Danger of oscillations

C7

1000 µF

Output DC decoupling

Higher low-frequency cutoff