TDA7561 Datasheet, PDF (9/19 Pages) STMicroelectronics – MULTIFUNCTION QUAD POWER AMPLIFIER WITH BUILT-IN DIAGNOSTICS FEATURES

TDA7561
Fig. 15 and 16 show SVR and OUTPUT waveforms at the turn-on (stand-by out) with and without TURN-ON
DIAGNOSTIC.
Figure 15. 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 16. SVR and Output pin behaviour (CASE 2: with turn-on diagnostic)
V svr
Out
Tu rn - o n d i a g n o s t ic
acquis itio n tim e (10 0m S Typ)
Perm an ent diagn ostic
a c q u i s itio n tim e (1 0 0 m S Ty p )
t
D iagno stic Enab le
(Turn-o n)
Tu r n - o n D ia g n o s tic s d a ta (o u t p u t)
p erm itted tim e
D iagno stic E nable
(Pe rm anent)
FA U LT
event
I2 C B D ATA
B ias (pow e r am p turn -on)
perm itted tim e
R ead D ata
Perm an ent Dia gnostics da ta (o utput)
perm itted tim e
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:
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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