TDA7563PD View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TDA7563PD

Multifunction quad power amplifier with built-in diagnostics features

STMicroelectronics 

TDA7563PD

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

t(s Turn On diagnostic status is internally stored until a successive diagnostic pulse is

c requested (after a I2C reading).

du If the "standby out" and "diagnostic enable" commands are both given through a single

ro ) programming step, the pulse takes place first (power stage still in standby mode, low,

P t(s outputs = high impedance).

te c Afterwards, when the amplifier is biased, the PERMANENT diagnostic takes place. The

le u previous Turn On state is kept until a short appears at the outputs.

so rod Figure 18. Turn-on diagnostic: working principle

) - Ob lete P Vs~5V

ct(s bso Isource

rodu ) - O CH+

P t(s CH-

solete roduc Isink

I (mA)

Isource

Isink

~100mS

Measure time

t (ms)

Ob solete P Figure 19 and 20 show SVR and OUTPUT waveforms at the turn-on (standby out) with and

Ob without TURN-ON DIAGNOSTIC.

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