APPLICATION SUGGESTION

The recommended values of the external components are those shown on the application circuit of fig. 21.

Ω resistor must be connected between pin 2 and pin 3

in order to obtain the maximum output power.

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

Component

Raccom.

value

Purpose

Larger than

recommended value

Smaller than

recommended value

Allowed range

Min.

Max.

10K

Ω

Input signal imped.

for muting operation

Increase of the

attenuation in muting-on

condition. Decrease of

the input sensitivity.

Decrease of the attenu-

ation in muting on

condition.

10K

Ω

Feedback resistors

Increase of gain.

Decrease of gain.

Increase quiescent

current.

100

Ω

Decrease of gain.

Increase of gain.

1K

Ω

1K

Ω

Frequency stability

Danger of oscillation at

high frequencies with

inductive loads.

100

Ω

Increase of the output

swing with low supply

voltage.

47

330

20K

Ω

Volume potentiometer

Increase of the

switch-on noise.

Decrease of the input

impedance and of the

input level.

10K

Ω 100KΩ

0.22

µF

Input DC

decoupling.

Higher cost

lower noise.

Higher low

frequency cutoff.

Higher noise.

2.2

µF

Inverting input DC

decoupling.

Increase of the switch-

on noise.

Higher low frequency

cutoff.

0.1

µF

0.1

µF

Supply voltage

bypass.

Danger of

oscillations.

10

µF

Ripple rejection

Increase of SVR

increase of the

switch-on time

Degradation of SVR

2.2

µF 100µF

47

µF

Bootstrap.

Increase of the

distortion at low

frequency.

10

µF 100µF

0.22

µF

Frequency stability.

Danger of oscillation.

1000

µF Output DC decoupling.

Higher low frequency

cutoff.

11/14

TDA1905