TDA7350 datasheet(10/22 Pages) STMICROELECTRONICS

10 / 22 page

after power-on).

Fig. 25 represents the detailed turn-on transient

with reference to the stereo configuration.

At the power-on the output decoupling capacitors

are charged through an internal path but the de-

vice itself remains switched off (Phase 1 of the

represented diagram).

When the outputs reach the voltage level of about

1V (this means that there is no presence of short

circuits) the device switches on, the SVR capaci-

tor starts charging itself and the output tracks ex-

actly the SVR pin.

During this phase the device is muted until the

SVR reaches the ”Play” threshold (~2.5V typ.), af-

ter that the music signal starts being played.

Stereo/Bridge Switching

There is also no need for external components for

changing from stereo to bridge configuration (figg.

24-27).

A simple short circuit between two pins allows

phase reversal at one output, yet maintaining the

quiescent output voltage.

Stand-by

The device is also equipped with a stand-by func-

tion, so that a low current, and hence low cost

switch, can be used for turn on/off.

Stability

The device is provided with an internal compen-

sation wich allows to reach low values of closed

loop gain.

In this way better performances on S/N ratio and

SVR can be obtained.

Figure 24: Block Diagram; Stereo Configuration

TDA7350A

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