TDA7384 Ver la hoja de datos (PDF) - STMicroelectronics

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TDA7384

4 x 35W QUAD BRIDGE CAR RADIO AMPLIFIER

STMicroelectronics 

Figure 9: Output Noise vs. Source Resistance

TDA7384A

Figure 10: Power Dissipation & Efficiency vs.

Output Power

APPLICATION HINTS (ref. to the circuit of fig. 1)

SVR

Besides its contribution to the ripple rejection, the

SVR capacitor governs the turn ON/OFF time se-

quence and, consequently, plays an essential role

in the pop optimization during ON/OFF transients.

To conveniently serve both needs, ITS MINIMUM

RECOMMENDED VALUE IS 10µF.

INPUT STAGE

The TDA7384A’S inputs are ground-compatible

and can stand very high input signals (± 8Vpk)

without any performances degradation.

If the standard value for the input capacitors

(0.1µF) is adopted, the low frequency cut-off will

amount to 16 Hz.

STAND-BY AND MUTING

STAND-BY and MUTING facilities are both

CMOS-COMPATIBLE. If unused, a straight con-

nection to Vs of their respective pins would be ad-

missible. Conventional/low-power transistors can

be employed to drive muting and stand-by pins in

absence of true CMOS ports or microprocessors.

R-C cells have always to be used in order to

smooth down the transitions for preventing any

audible transient noises.

Since a DC current of about 10 uA normally flows

out of pin 22, the maximum allowable muting-se-

ries resistance (R2) is 70KΩ, which is sufficiently

high to permit a muting capacitor reasonably

small (about 1µF).

If R2 is higher than recommended, the involved

risk will be that the voltage at pin 22 may rise to

above the 1.5 V threshold voltage and the device

will consequently fail to turn OFF when the mute

line is brought down.

About the stand-by, the time constant to be as-

signed in order to obtain a virtually pop-free tran-

sition has to be slower than 2.5V/ms.

7/9

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