Application information

TDA7491MV

20/28

DocID14576 Rev 4

7

Application information

7.1

Mode selection

The three operating modes of the TDA7491MV are set by the two inputs STBY (pin 20) and

MUTE (pin 21).



Standby mode: all circuits are turned off, very low current consumption.



Mute mode: inputs are connected to ground and the positive and negative PWM

outputs are at 50% duty cycle.



Play mode: the amplifiers are active.

The protection functions of the TDA7491MV are realized by pulling down the voltages of the

STBY and MUTE inputs shown in Figure 19. The input current of the corresponding pins

must be limited to 200 µA.

Figure 19. Standby and mute circuits

Figure 20. Turn-on/off sequence for minimizing speaker “pop”

Table 7. Mode settings

Mode Selection

STBY

MUTE

Standby

L (1)

1.

Drive levels defined in Table 5: Electrical specifications on page 8

X (don’t care)

Mute

H (1)

L

Play

H

H

STBY

MUTE

0 V

3.3 V

C7

2.2 µF

R2

30 k



Standby

0 V

3.3 V

C15

2.2 µF

R4

30 k



Mute

TDA7491MV