TDA7491LP13TR Datasheet, PDF (25/37 Pages) STMicroelectronics – 2 x 5-watt dual BTL class-D audio amplifier

TDA7491LP
Applications information
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.
Table 6. Mode settings
Mode
Voltage level on pin STBY
Voltage level on pin MUTE
Standby
Mute
L ⁽¹⁾
H ⁽¹⁾
X (don’t care)
L
Play
H
H
1. Refer to V_STBY and V_MUTE in Table 5: Electrical specifications on page 10 for the drive levels for L and H
Figure 27. Standby and mute circuits
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
TDA7491LP
MUTE
Figure 28. Turn-on/off sequence for minimizing speaker “pop”
Doc ID 13541 Rev 5
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