TDA7569LVPD datasheet(17/39 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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17 / 39 page

TDA7569LV

Diagnostics functional description

Doc ID 018712 Rev 3

17/39

Diagnostics functional description

4.1

Turn-on diagnostic

It is strongly recommended to activate this feature at turn-on (standby out) with 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 22) 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 a 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 22. Turn-on diagnostic: working principle

Figure 23 and 24 show SVR and OUTPUT waveforms at the turn-on (stand-by out) with and

without turn-on diagnostic.

Figure 23. SVR and output behavior (Case 1: without turn-on diagnostic)

TDA7569LVPD Datasheet(PDF) 17 Page - STMicroelectronics