TDA7491LP datasheet(25/37 Pages) STMICROELECTRONICS

25 / 37 page

TDA7491LP

Applications information

Doc ID 13541 Rev 5

25/37

5.2

Mode selection

The three operating modes, defined below, of the TDA7491LP are set by the two inputs

STBY (pin 20) and MUTE (pin 21) as shown in Table 6.

●

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 TDA7491LP are implemented by pulling down the voltages of

the STBY and MUTE inputs shown in Figure 27. The input current of the corresponding pins

must be limited to 200 µA.

Figure 27.

Standby and mute circuits

Figure 28.

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

Table 6.

Mode settings

Mode

Voltage level on pin STBY

Voltage level on pin MUTE

Standby

L (1)

Refer to VSTBY and VMUTE in Table 5: Electrical specifications on page 10 for the drive levels for L and H

X (don’t care)

Mute

H (1)

Play

STBY

MUTE

0 V

3.3 V

2.2 µF

30 k

Standby

0 V

3.3 V

C15

2.2 µF

30 k

Mute

TDA7491LP

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