TDA7577BLVPD datasheet(18/43 Pages) STMICROELECTRONICS

Part #	TDA7577BLVPD

Description	2 x 75 W dual-bridge power amplifier with I2C complete diagnostics and

PDF	43 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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18 / 43 page

Diagnostics functional description

TDA7577BLV

18/43

DocID025375 Rev 5

Figure 25. 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 plateau. 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 26. 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 27. 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 28. Load detection thresholds - high gain setting

TDA7577BLVPD Datasheet(PDF) 18 Page - STMicroelectronics