TDA7566_06 Datasheet, PDF (13/28 Pages) STMicroelectronics – 4x40W multifunction quad power amplifier with built-in diagnostics features

TDA7566
Diagnostics functional description
Figure 17. SVR and Output behaviour (CASE 1: without turn-on diagnostic)
Vsvr
Out
Permanent diagnostic
acquisition time (100mS Typ)
Bias (power amp turn-on)
Diagnostic Enable
(Permanent)
FAULT
event
t
Read Data
I2CB DATA
Permanent Diagnostics data (output)
permitted time
Figure 18. SVR and Output pin behaviour (CASE 2: with turn-on diagnostic)
Vsvr
Out
Turn-on diagnostic
acquisition time (100mS Typ)
Permanent diagnostic
acquisition time (100mS Typ)
t
Diagnostic Enable
(Turn-on)
Turn-on Diagnostics data (output)
permitted time
Diagnostic Enable
(Permanent)
FAULT
event
Bias (power amp turn-on)
permitted time
Read Data
Permanent Diagnostics data (output)
permitted time
I2CB DATA
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:
Figure 19. Thresholds for SHORT TO GND/V_S
S.C. to GND x Normal Operation x
S.C. to Vs
0V
1.2V 1.8V
V_S-1.8V V_S-1.2V
V_S
D01AU1253
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