Component

Raccom.

value

Purpose

Larger than

raccomanded value

Smaller than

raccomanded value

Allowed range

Min.

Max.

10 K

Ω

Close loop gain

setting

Increase of gain.

Decrease of gain.

Increase quiescent

current.

100

Ω

Close loop gain

setting.

Decrease of gain.

Increase of gain.

1

Ω

Frequency stability

Danger of oscillation at

hight frequencies with

inductive loads.

100

Ω

Increaseing of output

swing with low Vs.

47

Ω

330

Ω

2.2

µF

Input DC

decoupling.

Lower noise.

Higher low

frequency cutoff.

Higher noise.

0.1

µF

0,1

µF

Supply voltage

bypass.

Danger of

oscillations.

2.2

µF

Inverting input DC

decoupling.

Increase of the

switch-on noise

Higher low

frequency cutoff.

0.1

µF

10

µF

Ripple Rejection.

Increase of SVR.

Increase of the

switch-on time.

Degradation of

SVR.

2.2

µF 100 µF

47

µF

Bootstrap

Increase of the

distorsion at low

frequency

10 mF 100

µF

0.22

µF

Frequency stability.

Danger of oscillation.

1000

µF

Output DC

decoupling.

Higher low

frequency cutoff.

APPLICATION SUGGESTION

The recommended values of the external components are those shown on the application circuit of fig. 19.

When the supply voltage Vs is less than 10V, a 100

Ω resistor must be connectedbetween pin 1 and pin 4

in order to obtain the maximum output power.

Different values can be used. The following table can help the designer.

9/12

TDA1908