TDA7563PDTR Просмотр технического описания (PDF) - STMicroelectronics

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TDA7563PDTR

Multifunction quad power amplifier with built-in diagnostics features

STMicroelectronics 

TDA7563PD

4

Output DC offset detection

Output DC offset detection

Any DC output offset exceeding ±2 V are signalled out. This inconvenient might occur as a

consequence of initially defective or aged and worn-out input capacitors feeding a DC

component to the inputs, so putting the speakers at risk of overheating.

This diagnostic has to be performed with low-level output AC signal (or Vin = 0).

The test is run with selectable time duration by microprocessor (from a "start" to a "stop"

command):

– START = Last reading operation or setting IB1 - D5 - (OFFSET enable) to 1

– STOP = Actual reading operation

) Excess offset is signalled out if persistent throughout the assigned testing time. This feature

t(s is disabled if any overloads leading to activation of the short-circuit protection occurs in the

process.

OObbssoolleettee PPrroodduucctt((ss)) -- OObbssoolleettee PPrroodduucct(s) 4.1

Multiple faults

When more misconnections are simultaneously in place at the audio outputs, it is

guaranteed that at least one of them is initially read out. The others are notified after

successive cycles of I2C reading and faults removal, provided that the diagnostic is enabled.

This is true for both kinds of diagnostic (Turn on and Permanent).

The table below shows all the couples of double-fault possible. It should be taken into

account that a short circuit with the 4 ohm speaker unconnected is considered as double

fault.

Table 4.

Double fault table for turn on diagnostic

S. GND (so) S. GND (sk)

S. Vs

S. Across L. Open L.

S. GND (so)

S. GND

S. GND

S. Vs + S. GND

S. GND

S. GND

S. GND (sk)

/

S. GND

S. Vs

S. GND

Open L. (*)

S. Vs

/

/

S. Vs

S. Vs

S. Vs

S. Across L.

/

/

/

S. Across L.

N.A.

Open L.

/

/

/

/

Open L. (*)

S. GND (so) / S. GND (sk) in the above table make a distinction according to which of the 2

outputs is shorted to ground (test-current source side= so, test-current sink side = sk). More

precisely, in Channels LF and RR, so = CH+, sk = CH-; in Channels LR and RF, so = CH-, sk

= CH+.

In Permanent Diagnostic the table is the same, with only a difference concerning Open

Load(*), which is not among the recognizable faults. Should an Open Load be present

during the device's normal working, it would be detected at a subsequent Turn on Diagnostic

cycle (i.e. at the successive Car Radio Turn on).

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