Application information

TDA7491HV

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7

Application information

7.1

Mode selection

The three operating modes of the TDA7491HV 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 TDA7491HV are realized by pulling down the voltages of the

STBY and MUTE inputs shown in Figure 23. The input current of the corresponding pins

must be limited to 200 µA.

Figure 23.

STBY and MUTE circuit

Figure 24.

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 7.

X (don’t care)

Mute

H (1)

L

Play

H

H

TDA7491HV