TDA7491MV Datasheet, PDF (20/28 Pages) STMicroelectronics – 25 W mono BTL class-D audio amplifier

Application information
7
Application information
TDA7491MV
7.1
Mode selection
The three operating modes of the TDA7491MV are set by the two inputs STBY (pin 20) and
MUTE (pin 21).
z Standby mode: all circuits are turned off, very low current consumption.
z Mute mode: inputs are connected to ground and the positive and negative PWM
outputs are at 50% duty cycle.
z 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.
Table 7. Mode settings
Mode Selection
Standby
Mute
L ⁽¹⁾
H ⁽¹⁾
STBY
Play
H
1. Drive levels defined in Table 5: Electrical specifications on page 8
Figure 19. Standby and mute circuits
MUTE
X (don’t care)
L
H
Standby
3.3 V
0V
Mute
3.3 V
0V
R2
30 kΩ
R4
30 kΩ
C7
2.2 µF
C15
2.2 µF
STBY
TDA7491MV
MUTE
Figure 20. Turn-on/off sequence for minimizing speaker “pop”
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Doc ID 14576 Rev 2