TDA7563ASM_08 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TDA7563ASM_08

4 x 50W multifunction quad power amplifier with built-in diagnostics feature

STMicroelectronics 

TDA7563A

Diagnostics functional description

3

Diagnostics functional description

3.1

Turn-on diagnostic

It is activated at the turn-on (standby 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 19) 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 "diagnostic enable" commands are both given through a single

programming step, the pulse takes place first (power stage still in standby 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 19. Turn-on diagnostic: working principle

Vs~5V

Isource

CH+

CH-

Isink

I (mA)

Isource

Isink

~100mS

Measure time

t (ms)

Figure 20 and 21 show SVR and OUTPUT waveforms at the turn-on (standby out) with and

without TURN-ON DIAGNOSTIC.

13/35

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