TDA7492P13TR Datasheet, PDF (18/26 Pages) STMicroelectronics – 25-watt + 25-watt dual BTL class-D audio amplifier

Applications information
6
Applications information
TDA7492P
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.
Table 6. 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 21. 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
TDA7492P
MUTE
Figure 22. Turn-on/off sequence for minimizing speaker “pop”
VCC
0
STBY
0
MUTE
0
Input
0
Output
0
Standby Mute
Play
I_q
0
t
t
t
t
t
Mute Standby
t
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Doc ID 15068 Rev 5