TDA7350A Datasheet, PDF (10/22 Pages) STMicroelectronics – 22W BRIDGE-STEREO AMPLIFIER FOR CAR RADIO

TDA7350A
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
Figure 24: Block Diagram; Stereo Configuration
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.
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