TDA7385 datasheet(9/12 Pages) STMICROELECTRONICS

9 / 12 page

MUTE PIN

VOLTAGE

OUTPUT

WAVEFORM

Vpin 25

WAVEFORM

SHORT TO GND

OR TO Vs

D95AU304

CLIPPING

THERMAL

PROXIMITY

ST-BY PIN

VOLTAGE

Figure 14: Diagnostics Waveforms.

reached.

As various kind of diagnostics information is avail-

able at pin 25 (CLIPPING, SHORTS AND OVER-

HEATING), it may be necessary to operate some

distinctions on order to treat each event sepa-

rately. This could be achieved by taking into ac-

count the intrinsically different timing of the diag-

nostics output under each circumstance.

In fact, clipping will produce pulses normally

much shorter than those present under faulty con-

ditions. An example of circuit able to distinguish

between the two occurrences is shown by fig. 15.

STABILITY AND LAYOUT CONSIDERATIONS

If properly layouted and hooked to standard car-

radio speakers, the TDA7385 will be intrinsically

stable with no need of external compensations

CLIP DET. (TO GAIN

COMPRESSOR/

TONE CONTROL)

D95AU305

TDA7385

VREF

VREF1

FAULT, THERMAL SHUTDOWN

(TO POWER SUPPLY

SECTION,

µP VOLTAGE

REGULATOR, FLASHING SYSTEM)

VREF2

T1 << T2

VREF

≥ VREF1 >> VREF2

Figure 15.

TDA7385

9/12

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