TDA7350A datasheet(16/22 Pages) STMICROELECTRONICS

16 / 22 page

APPLICATION HINTS

This section explains briefly how to get the best

from the TDA7350A and presents some applica-

tion circuits with suggestions for the value of the

components.Thesevalues can change depending

on the characteristics that the designer of the car

radio wants to obtain,or other parts of the car ra-

dio that are connected to the audio block.

To optimize the performance of the audio part it is

useful (or indispensable) to analyze also the parts

outside this block that can have an interconnec-

tion with the amplifier.

This method can provide components and system

cost saving.

Reducing Turn On-Off Pop

The TDA7350A has been designed in a way that

the turn on(off) transients are controlled through

the charge(discharge) of the Csvr capacitor.

As a result of it, the turn on(off) transient spec-

trum contents is limited only to the subsonic

range.The following section gives some brief

notes to get the best from this design feature(it

will refer mainly to the stereo application which

appears to be in most cases the more critical from

the pop viewpoint.The bridge connection in

fact,due to the common mode waveform at the

outputs,doesnot give pop effect).

TURN-ON

Fig. 39 shows the output waveform (before and

after the ”A” weighting filter) compared to the

value of Csvr.

Better pop-on performance is obtained with

higher Csvr values (the recommended range is

from 22uF to 220uF).

The turn-on delay (during which the amplifier is in

mute condition) is a function essentially of : Cout ,

Csvr .

Being:

≈ 120 • Cout

≈ 1200 • Csvr

The turn-on delay is given by:

T1+T2

STEREO

BRIDGE

The best performance is obtained by driving the

st-by pin with a ramp having a slope slower than

2V/ms

Figure 39:

a) Csvr =22

µF

b) Csvr =47

µF

c) Csvr = 100

µF

TDA7350A

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