TDA7383 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

TDA7383

4 x 30W QUAD BRIDGE CAR RADIO AMPLIFIER

STMicroelectronics 

Figure 14: Diagnostics Waveforms.

ST-BY PIN

VOLTAGE

TDA7383

t

MUTE PIN

VOLTAGE

t

t(s) Vs

c OUTPUT

u WAVEFORM

rod t

te P Vpin 25

le WAVEFORM

Obso D95AU304

t

CLIPPING

SHORT TO GND THERMAL

OR TO Vs

PROXIMITY

) - reached.

t(s As various kind of diagnostics information is avail-

c able at pin 25 (CLIPPING, SHORTS AND OVER-

u HEATING), it may be necessary to operate some

d distinctions on order to treat each event sepa-

ro rately. This could be achieved by taking into ac-

count the intrinsically different timing of the diag-

P 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 TDA7383 will be intrinsically

stable with no need of external compensations

lete Figure 15.

Obso VREF

25

T1

T2

T1 << T2

VREF ≥ VREF1 >> VREF2

-

+

VREF1

-

+

VREF2

CLIP DET. (TO GAIN

COMPRESSOR/

TONE CONTROL)

FAULT, THERMAL SHUTDOWN

(TO POWER SUPPLY

SECTION, µP VOLTAGE

REGULATOR, FLASHING SYSTEM)

D95AU305A

9/12

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