2 × 0.7W BTL AUDIO AMPLIFIER WITH OUTPUT CHANNEL SWITCHING

DESCRIPTION

The UTC TDA8547 is a two channel audio power amplifier for

an output power of 2 × 0.7W with a 16Ω load at a 5V supply. At a

low supply voltage of 3.3V an output power of 0.6W with an 8Ω

load can be obtained. The circuit contains two BTL amplifiers with

a complementary PNP-NPN output stage and standby/mute logic.

The operating condition of all channels of the device (standby,

mute or on) is externally controlled by the MODE pin. With the

SELECT pin one of the output channels can be switched in the

standby condition. This feature can be used for loudspeaker

selection and also reduces the quiescent current consumption.

When only one channel is used the maximum output power is

1.2W.

FEATURES

* Selection between output channels

* Flexibility in use

* Few external components

* Low saturation voltage of output stage

* Gain can be fixed with external resistors

* Standby mode controlled by CMOS compatible levels

* Low standby current

* No switch-on/switch-off plops

* High supply voltage ripple rejection

* Protected against electrostatic discharge

* Outputs short-circuit safe to ground, VCC and across the load

* Thermally protected