TDA7360 datasheet(9/22 Pages) 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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