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TDA7350 Fiches technique(PDF) 9 Page - STMicroelectronics

No de pièce TDA7350
Description  22W BRIDGE-STEREO AMPLIFIER FOR CAR RADIO
Download  22 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7350 Fiches technique(HTML) 9 Page - STMicroelectronics

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AMPLIFIER ORGANIZATION
The TDA7350A has been developed taking care
of the key concepts of the modern power audio
amplifier for car radio such as: space and costs
saving due to the minimized external count, ex-
cellent electrical performances, flexibility in use,
superior reliability thanks to a built-in array of pro-
tections. As a result the following performances
has been achieved:
NO NEED OF BOOTSTRAP CAPACITORS
EVEN AT THE HIGHEST OUTPUT POWER
LEVELS
ABSOLUTE STABILITY WITHOUT EXTER-
NAL COMPENSATION THANKS TO THE IN-
NOVATIVE OUT STAGE CONFIGURATION,
ALSO
ALLOWING
INTERNALLY
FIXED
CLOSED LOOP LOWER THAN COMPETI-
TORS
LOW GAIN (30dB STEREO FIXED WITHOUT
ANY EXTERNAL COMPONENTS) IN ORDER
TO MINIMIZE THE OUTPUT NOISE AND OP-
TIMIZE SVR
SILENT MUTE/ST-BY FUNCTION FEATUR-
ING ABSENCE OF POP ON/OFF NOISE
HIGH SVR
STEREO/BRIDGE
OPERATION
WITHOUT
ADDITION OF EXTERNAL COMPONENT
AC/DC SHORT CIRCUIT PROTECTION (TO
GND, TO VS, ACROSS THE LOAD)
LOUDSPEAKER PROTECTION
DUMP PROTECTION
ESD PROTECTION
BLOCK DESCRIPTION
Polarization
The device is organized with the gain resistors di-
rectly connected to the signal ground pin i.e. with-
out gain capacitors (fig. 24).
The non inverting inputs of the amplifiers are con-
nected to the SVR pin by means of resistor divid-
ers, equal to the feedback networks. This allows
the outputs to track the SVR pin which is suffi-
ciently slow to avoid audible turn-on and turn-off
transients.
SVR
The voltage ripple on the outputs is equal to the
one on SVR pin: with appropriate selection of
CSVR, more than 55dB of ripple rejection can be
obtained.
Delayed Turn-on (muting)
The CSVR sets a signal turn-on delay too. A circuit
is included which mutes the device until the volt-
age on SVR pin reaches ~2.5V typ (fig. 25). The
mute function is obtained by duplicating the input
differential pair (fig. 26): it can be switched to the
signal source or to an internal mute input. This
feature is necessary to prevent transients at the
inputs reaching the loudspeaker(s) immediately
Figure 21: Power Dissipation & Efficiency vs.
Output Power (Stereo)
Figure 22: Power Dissipation & Efficiency vs.
Output Power (Bridge)
Figure 23: Power Dissipation & Efficiency vs.
Output Power (Bridge)
TDA7350A
9/22


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