TDA7560 datasheet(8/10 Pages) STMICROELECTRONICS

8 / 10 page

468

Po (W)

Ptot (W)

Vs= 13.2V

RL= 4 x 2 Ohm

CLIP START

GAUSSIAN NOISE

Figure 16. Power dissipation vs. output power

(Music/Speech Simulation)

23456

Po (W)

Ptot (W)

Vs= 13.2V

RL= 4 x 4 Ohm

CLIP START

GAUSSIAN NOISE

Figure 15. Power dissipation vs. ouput power

(Music/Speech Simulation)

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 tran-

sients.To conveniently serve both needs, ITS

MINIMUM RECOMMENDED VALUE IS 10

µF.

INPUT STAGE

The TDA7560’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

(0.1

µF) 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.

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.

HEATSINK DEFINITION

Under normal usage (4 Ohm speakers) the

heatsink’s thermal requirements have to be de-

duced from fig. 15, which reports the simulated

power dissipation when real music/speech pro-

grammes are played out. Noise with gaussian-

distributed amplitude was employed for this simu-

lation. Based on that, frequent clipping occurence

(worst-case) will cause Pdiss = 26W. Assuming

Tamb = 70

°C and TCHIP = 150°C as boundary

conditions, the

heatsink’s thermal resistance

should be approximately 2

°C/W. This would avoid

any thermal shutdown occurence even after long-

term and full-volume operation.

TDA7560

8/10

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