Application information

TDA7492E

12/24

DocID027638 Rev 1

The thresholds in MUTE mode are reduced to about 1/2 and two typical thresholds are as

follows.

Table 10: Overcurrent protection (mute mode)

I (Shutdown)

High side (A)

6.2

Low side (A)

5.9

4.3.2

Thermal protection

When internal die temperature exceeds 140 °C, the device enters into Mute by pulling the

MUTE pin low first.

When internal die temperature exceeds 150 °C, the device directly shuts down the power

stage. The TDA7492E automatically recovers when the temperature become lower than

the threshold.

4.3.3

Power limit

A built-in power limit is used to limit the output voltage level below the supply rail by limiting

the duty cycle. The limit level is set through the voltage at PLIMIT (pin 30). The pin voltage

is set by the following equation:

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Figure 4: Recommended power limit pin connections

It is recommended that external resistors are less than 40 kΩ if a voltage divider is used as

shown in Figure 4: "Recommended power limit pin connections". The relationship of the

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����������������������������������������×2×����������������+1�

2

is the series resistance including Rdson of power transistor, output filter resistance and

bonding wire resistance. Rload is the load resistance.

VDDS

Power

Limiter

Rup

Rdn

PLIMIT