Pins description

TDA7391PD

4/12

Doc ID 6326 Rev 4

2

Pins description

Figure 3.

Pins connection (top view)

Table 2.

Pins function

Pin

Function

Description

14, 15

INPUTS

The input stage is a high impedance type also capable of operation in single

ended mode with one input capacitively coupled to the signal GND. The

impedance seen by the inverting and non inverting input pins must be

matched.

5, 16

S

Supply voltage.

17

CD

The TDA7391PD is equipped with a diagnostic circuitry able to detect the

clipping in the Output Signal (distortion = 10%).

The CD pin (open collector) gives out low level signal during clipping.

2, 19

OUTPUTS

The output stage is a bridge type able to drive loads as low as 3.2

Ω. It consists

of two class AB fully complementary PNP/NPN stages fully protected.

A rail to rail output voltage swing is achieved without need of bootstrap

capacitors.

No external compensation is necessary.

1, 10,

11, 20

GND

Power Ground.

12

S-GND

Signal ground.

4

STAND-BY

The device features a ST-BY function which shuts down all the internal bias

supplies when the ST-BY pin is low. In ST-BY mode the amplifier sinks a small

current (in the range of few

μA). When the ST-BY pin is high the IC becomes

fully operational.

8

SYNC

the current

time required to bias the amplifier.

9MUTE

time.

An automatic Mute during turn on/off is provided to prevent noisy transients.