TDA7562B Datasheet, PDF (14/30 Pages) STMicroelectronics – 4 x 46 W multifunction quad power amplifier with built-in diagnostics features

Diagnostics functional description
TDA7562B
Figure 17. SVR and output behavior (case 1: without turn-on diagnostic)
6SVR
/UT
0ERMANENTDIAGNOSTIC
ACQUISITIONTIMEMS4YP
"IASPOWER AMPT URN ON
)#"$!4!
$IAGNOSTIC %NABLE
0ERMANENT
&! 5,4
EVENT
2EAD$ATA
0ERMANENT$IAGNOSTICSDATAOUPUT
PERMITTEDTIME
Figure 18. SVR and output pin behavior (case 2: with turn-on diagnostic)
T
'!0'03
6SVR
/UT
4U RN OND IAGNOSTIC
ACQU ISI TIONTIM EMS 4YP
0ERMANENTDIAGN OST IC
ACQUI SIT IONTIMEMS 4YP
T
$IAGNOST IC%NABLE
4UR N ON
4URN ON $IAGN OST ICS DATAOUT PU T
PER MITT EDTI ME
$IAGN OST IC% NABLE
0ERMAN ENT
&! 5,4
EVENT
)#"$!4!
"IASPOWERAMP TURN ON
PERMITTE DT IME
2EAD$ATA
0ERMANENT$IAGNO ST ICS DAT AOUT PUT
PERMITTE DTIME
'!0'03
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
30 dB to 16 dB gain setting. They are as follows:
Figure 19. Thresholds for short to GND/V_S
3#TO'.$ X .ORMAL/PERATION X
3#TO6S
6
6 6
6₃ 6 6₃ 6
6₃
'!0'03
Concerning short across the speaker / open speaker, the threshold varies from 30 dB to
16 dB gain setting, since different loads are expected (either normal speaker's impedance
or high impedance). The values in case of 30 dB gain are as follows:
14/30
Doc ID 17984 Rev 2