TDA7803A datasheet(32/72 Pages) STMICROELECTRONICS

32 / 72 page

Functional description

TDA7803A

32/72

DS12195 Rev 7

6.6

Double faults

Faults can occur simultaneously. When this happens, faults are read out in accordance with

the priority table (Table 7).

Please note that a "short to GND" and a "short to VS" can be simultaneously read only when

an open load is present; however it would mean three faults at the same time, which is not

covered by TDA7803A.

6.7

Thermal protection

The TDA7803A has four thermal warning thresholds (Tw1, Tw2, Tw3, Tw4) which are stored

in I2C data bytes. Only one of the thermal warnings can be sent to the pin CDdiag and it is

selectable via I2C bus.

A temperature dependent mute function is implemented in order to protect the junction

against over temperature events and prevent the IC from sound quality degradation. For

temperatures higher than Tpl, the device is gradually forced to the mute state. When the

temperature is Tpl the output signal is attenuated by 0.5 dB, while at the Tph the attenuation

is >60 dB. The distortion is kept low throughout the whole muting transition. The thermal

protection's behaviour is shown in Figure 37.

Table 7. Double faults priority

Soft short to

GND(1)

1. Open load, soft short to GND and soft short to Vs are only available for the turn-on diagnostic;

in fact the permanent diagnostic can be triggered from an over current event, and none of

these events can be the cause of an over current.

Soft short to

Vs(1)

Short to

GND

Short to

Short across

load

Open

load(1)

Soft short to

GND

Soft Short to

GND

Short to

GND

Soft Short to

GND

Soft Short

to GND

Soft short to

Soft Short to

Short to

Soft Short to Vs

Soft Short

to Vs

Short to GND Short to GND

Short to

GND

Short to GND

Short to

GND

Short to Vs

Short to

Short to Vs

Short to

Short across

load

Short across load

N.A.

Open load

Open

Load

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