TDA7569LVPD datasheet(18/39 Pages) STMICROELECTRONICS

Part #	TDA7569LVPD

Description	4 x 50 W power amplifier with full I2C diagnostics,high efficiency and low voltage operation

PDF	39 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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18 / 39 page

Diagnostics functional description

TDA7569LV

18/39

Doc ID 018712 Rev 3

Figure 24. SVR and output pin behavior (Case 2: with turn-on diagnostic)

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 16 dB gain setting. They are as follows:

Figure 25. Short circuit detection thresholds

Concerning SHORT ACROSS THE SPEAKER / OPEN SPEAKER, the threshold varies

from 26 dB to 16 dB gain setting, since different loads are expected (either normal speaker's

impedance or high impedance). The values in case of 26 dB gain are as follows:

Figure 26. Load detection thresholds - high gain setting

If the Line-Driver mode (Gv= 16 dB and Line Driver Mode diagnostic = 1) is selected, the

same thresholds will change as follows:

Figure 27. Load detection threshold - low gain setting

TDA7569LVPD Datasheet(PDF) 18 Page - STMicroelectronics