TDA7491HV datasheet(33/50 Pages) STMICROELECTRONICS

Part #	TDA7491HV

Description	20 W 20 W dual BTL class-D audio amplifier

PDF	50 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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33 / 50 page

Application information

8.1

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 enabled by pulling down the voltages of the STBY and MUTE

inputs shown in figure below. The input current of the corresponding pins must be limited to 200 µA.

Table 6. Mode settings

Mode

STBY

MUTE

Standby

L(1).

X (do not care)

Mute

H(1)

Play

1. Refer to VSTBY and VMUTE in Section 4 Electrical specifications

Figure 51. Standby and mute circuits

STBY

MUTE

0 V

3.3 V

2.2 µF

30 k



Standby

0 V

3.3 V

C15

2.2 µF

30 k



Mute

TDA7491HV

Application information

DS5624 - Rev 10

page 33/50

TDA7491HV Datasheet(PDF) 33 Page - STMicroelectronics

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