TDA7575PD Datasheet, PDF (12/17 Pages) STMicroelectronics – MULTIFUNCTION DUAL BRIDGE POWER AMPLIFIER WITH INTEGRATED DIGITAL DIAGNOSTICS

TDA7575PD
Afterwards, when the Amplifier is biased, the PERMANENT diagnostic takes place. The previous Turn On state
is kept until a short appears at the outputs.
Fig A: Turn - On diagnostic: working principle
Vs~5V
Isource
I (mA)
Isource
CH+
CH-
Isink
Isink
~100mS
Measure time
t (ms)
Fig. B and C show SVR and OUTPUT waveforms at the turn-on (stand-by out) with and without TURN-ON DI-
AGNOSTIC.
Fig B: 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
FIG. C: 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)
12/17
t
Diagnostic Enable
(Turn-on)
Turn-on Diagnostics data (output)
permitted time
Diagnostic Enable
(Permanent)
FAULT
event
I2CB DATA
Bias (power amp turn-on)
permitted time
Read Data
Permanent Diagnostics data (output)
permitted time