Applications information

TDA7492P

18/26

Doc ID 15068 Rev 5

6

Applications information

6.1

Mode selection

The three operating modes of the TDA7492P 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 TDA7492P are enabled by pulling down the voltages of the

STBY and MUTE inputs shown in Figure 21. The input current of the corresponding pins

must be limited to 200 µA.

Figure 21.

Standby and mute circuits

Figure 22.

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

Table 6.

Mode settings

Mode selection

STBY

MUTE

Standby

1.

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

X (don’t care)

Mute

H (1)

L

Play

H

H

TDA7492P

STBY

MUTE

0 V

3.3 V

C7

2.2 µF

R2

30 k

Ω

Standby

0 V

3.3 V

C15

2.2 µF

R4

30 k

Ω

Mute

VCC

STBY

MUTE

Input

Output

Standby Mute

Play

Mute

Standby

t

t

t

t

t

t

0

0

0

0

0

0