FUNCTIONAL DESCRIPTION

Pin

Function

Description

1, 2

INPUTS

The input stage is a high impedance differential 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.

4

CD - DIA

The TDA7396 is equipped with a diagnostics circuitry able to detect the following events:

- Clipping in the Output Signal

- Thermal Shutdown

- Open Load (before turn-on)

- Shorted Output: to GND, to Vs, across the load (after turn-on)

The CD-DIA(open collector) pin gives out the diagnostics signal (low during clipping or

output fault condition).

The device does not work as long as the faulty condition holds; the normal operation is

automatically restored after the fault removal.

5, 7

OUTPUTS

The output stage is a bridge type able to drive loads as high as 2

Ω.

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

A rail to rail output voltage swing is achieved with no need of bootstrap capacitors.

No external compensation is necessary.

8

STAND-BY

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

when the ST-BY input 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.

10

SYNC

required to bias the amplifier.

11

MUTE

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

b) If a independent Mute function is needed, an external transistor circuit (see fig. 4) may

to reach the fixed limits 0.63

1

2

11

IN-

0.22

µF

0.22

µF

IN+

8

STANDBY

TO

µCor VS

10

6

OUT+

OUT-

7

5

4

Vref

CD-DIA

TDA7396

D93AU007

10K

Ω

1000

µF

GND

RS

CM

100nF

39

TO

µC

+VS

REXT

TO

µC

Figure 3: Application Circuit with External Mute Control

TDA7396

4/11