TDA7350A_05 Datasheet, PDF (9/23 Pages) STMicroelectronics – 22W BRIDGE-STEREO AMPLIFIER FOR CAR RADIO

Figure 24. Power Dissipation & Efficiency vs.
Output Power (Stereo)
Figure 25. Power Dissipation & Efficiency vs.
Output Power (Bridge)
Figure 26. Power Dissipation & Efficiency vs.
Output Power (Bridge))
TDA7350A
3 Amplifier Organization
The TDA7350A has been developed taking care of
the key concepts of the modern power audio am-
plifier for car radio such as: space and costs sav-
ing due to the minimized external count, excellent
electrical performances, flexibility in use, superior
reliability thanks to a built-in array of protections.
As a result the following performances has been
achieved:
■ NO NEED OF BOOTSTRAP CAPACITORS
EVEN AT THE HIGHEST OUTPUT POWER
LEVELS
■ ABSOLUTE STABILITY WITHOUT EXTERNAL
COMPENSATION THANKS TO THE NNOVA-
TIVE OUT STAGE CONFIGURATION, ALSO
ALLOWING INTERNALLY FIXED LOSED
LOOP LOWER THAN COMPETITORS
■ 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 V_S, ACROSS THE LOAD)
■ LOUDSPEAKER PROTECTION
■ DUMP PROTECTION
■ ESD PROTECTION
4 Block Description
4.1 Polarization
The device is organized with the gain resistors di-
rectly connected to the signal ground pin i.e. with-
out gain capacitors (fig. 27).
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 sufficient-
ly slow to avoid audible turn-on and turn-off tran-
sients.
4.2 SVR
The voltage ripple on the outputs is equal to the
one on SVR pin: with appropriate selection of CS-
VR, more than 55dB of ripple rejection can be ob-
tained.
9/23