TDA7564B Datasheet, PDF (18/34 Pages) STMicroelectronics – 4 x 50W multifunction quad power amplifier with built-in diagnostics features

Diagnostics functional description
TDA7564B
This feature is disabled if any overloads leading to activation of the short-circuit protection
occurs in the process.
Figure 27. Current detection high: load impedance |Z| vs. output peak voltage
Load |z| (Ohm)
50
Low current detection area
30
(Open load)
20
D5 = 1 of the DBx byres
Iout (peak) <250mA
Iout (peak) >500mA
10
IB2(D7) = 0
High current detection area
5
(Normal load)
D5 = 0 of the DBx bytes
3
2
1
1
2
3
4
5
6
7
8
Vout (Peak)
Figure 28. Current detection low: load impedance |Z| vs. output peak voltage
Load |z| (Ohm)
50
Low current detection area
30
(Open load)
20
D5 = 1 of the DBx byres
Iout (peak) <125mA
Iout (peak) >250mA
10
IB2(D7) = 1
High current detection area
5
(Normal load)
D5 = 0 of the DBx bytes
3
2
1
0.5
1
1.5
2
2.5
3
Vout (Peak)
3.5
4
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