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TDA7360HS Datasheet(PDF) 9 Page - STMicroelectronics |
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TDA7360HS Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 22 page AMPLIFIER ORGANIZATION The TDA7360 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 EXTER- NAL COMPENSATION THANKS TO THE IN- NOVATIVE OUT STAGE CONFIGURATION, ALSO ALLOWING INTERNALLY FIXED CLOSED LOOP LOWER THAN COMPETI- TORS LOW GAIN (20dB 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. 23). 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 60dB 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. 24): 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 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. Figure 22: Power Dissipation & Efficiency vs. Output Power (Bridge) Figure 21: Power Dissipation & Efficiency vs. Output Power (Bridge) TDA7360 9/22 |
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