TDA7562BEP datasheet(14/34 Pages) STMICROELECTRONICS

Part #	TDA7562BEP

Description	4 x 46 W multifunction quad power amplifier with built-in diagnostics features

PDF	34 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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14 / 34 page

Diagnostics functional description

TDA7562BEP

14/34

DocID028961 Rev 1

Diagnostics functional description

4.1

Turn-on diagnostic

It is activated at the turn-on (stand-by out) under I2C bus request. Detectable output faults

are:



Short to GND



Short to VS



Short across the speaker



Open speaker

To verify if any of the above misconnections are in place, a subsonic (inaudible) current

pulse (Figure 16) is internally generated, sent through the speaker(s) and sunk back.The

Turn On diagnostic status is internally stored until a successive diagnostic pulse is

requested (after an I2C reading).

If the ‘standby out’ and ‘diag. enable’ commands are both given through a single

programming step, the pulse takes place first (power stage still in stand-by mode, low,

outputs = high impedance).

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.

Figure 16. Turn-on diagnostic: working principle

Figure 17 and 18 show SVR and output waveforms at the turn-on (standby out) with and

without turn-on diagnostic.

TDA7562BEP Datasheet(PDF) 14 Page - STMicroelectronics