TDA7564

10/20

The information related to the outputs status is read and memorized at the end of the current pulse top. The

acquisition time is 100 ms (typ.). No audible noise is generated in the process. As for SHORT TO GND / Vs the

fault-detection thresholds remain unchanged from 26 dB to 12 dB gain setting. They are as follows:

Concerning SHORT ACROSS THE SPEAKER / OPEN SPEAKER, the threshold varies from 26 dB to 12 dB

gain setting, since different loads are expected (either normal speaker's impedance or high impedance). The

values in case of 26 dB gain are as follows:

If the Line-Driver mode (Gv= 12 dB and Line Driver Mode diagnostic = 1) is selected, the same thresholds will

change as follows:

b) PERMANENT DIAGNOSTICS.

Detectable conventional faults are:

– SHORT TO GND

– SHORT TO Vs

– SHORT ACROSS THE SPEAKER

The following additional features are provided:

– OUTPUT OFFSET DETECTION

The TDA7564 has 2 operating statuses:

1 RESTART mode. The diagnostic is not enabled. Each audio channel operates independently from each

other. If any of the a.m. faults occurs, only the channel(s) interested is shut down. A check of the output

status is made every 1 ms (fig. 19). Restart takes place when the overload is removed.

the intervention of the short-circuit protection) occurs to the speakers outputs. Once activated, the di-

agnostics procedure develops as follows (fig. 20):

– To avoid momentary re-circulation spikes from giving erroneous diagnostics, a check of the output sta-

tus is made after 1ms: if normal situation (no overloads) is detected, the diagnostic is not performed and

the channel returns back active.

– Instead, if an overload is detected during the check after 1 ms, then a diagnostic cycle having a duration

of about 100 ms is started.

D01AU1253

S.C. to GND

x

S.C. to Vs

0V

1.8V

x

Normal Operation

1.2V

S.C. across Load

x

Open Load

0V

1.75

Ω

45

Ω

Infinite

x

Normal Operation

0.5

Ω

85

Ω

D01AU1327

D02AU1340

S.C. across Load

x

Open Load

0

Ω

7

Ω

180

Ω

infinite

x

Normal Operation

2

Ω

330

Ω