TDA7350A datasheet(9/23 Pages) STMICROELECTRONICS

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TDA7350A

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))

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 VS, ACROSS THE LOAD)

■ LOUDSPEAKER PROTECTION

■ DUMP PROTECTION

■ ESD PROTECTION

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.

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