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TDA7350 Fiches technique(PDF) 9 Page - STMicroelectronics |
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TDA7350 Fiches technique(HTML) 9 Page - STMicroelectronics |
9 / 22 page 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 |
Numéro de pièce similaire - TDA7350 |
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Description similaire - TDA7350 |
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