4

Application information

4.1

Gain setting

The four gain settings of the TDA7492PE are set by GAIN (pin 31). Internally, gain is set by changing the

feedback resistors of the amplifier. The gain setting pins can be controlled by standard logic drivers.

Table 7. Gain settings

Voltage on GAIN pin

Total gain

Application recommendations

VGAIN < 0.25*VDDS

20.8 dB

GAIN pin connected to SGND

0.25*VDDS < VGAIN < 0.5*VDDS

26.8 dB

External resistor divider < 100 k

0.5*VDDS < VGAIN < 0.75*VDDS

30 dB

External resistor divider < 100 k

VGAIN > 0.75*VDDS

32.8 dB

GAIN pin connected to VDDS

4.2

Stereo and mono applications

The TDA7492PE can be used in stereo BTL or in mono BTL configuration. When the input pins, INPB and INNB

of the right channel are directly shorted to VDDS (without input capacitors) the device is in mono configuration as

shown in Figure 4. Mono BTL settings.

Figure 3. Mono BTL settings

INPA

INNA

INPB

INNB

OUTNB

OUTNA

OUTPA

OUTPB

IC

LC

Filter

4.3

Smart protections

4.3.1

Overcurrent protection (OCP)

If the overcurrent protection threshold is reached, the power stage will be shut down immediately. The device will

recover automatically when the fault is removed.

Table 8. Overcurrent protection

I (shutdown)

High-side (A)

11.2

Low-side (A)

10.0

The thresholds in mute mode are reduced to about 1/2 and two typical thresholds are as follows.

TDA7492PE

Application information

DS10652 - Rev 3

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