TDA7391PDUTR Datasheet, PDF (4/12 Pages) STMicroelectronics – 32 W bridge car radio amplifier

Pins description
2
Pins description
TDA7391PD
Figure 3. Pins connection (top view)
0 '.$

/54

.#

34 "9

6##

.#

.#

39.#

-54%

0 '.$


0 '.$ _{0 '.$}

/54
/54

.#
.#

#$
#$

6##
6##

).
).

).
).

.#
.#

3 '.$ _{3 '.$}

0 '.$ _{0 '.$}









3LUG UP











0 '.$
/54
.#
34 "9
6##
.#
.#
39.#
-54%
0 '.$
'!0'03
Table 2. Pins function
Pin Function
Description
14, 15
5, 16
17
INPUTS
+_VS
CD
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.
Supply voltage.
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 3.2Ω. 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.
The device features a ST-BY function which shuts down all the internal bias
4
STAND-BY
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.
A resistor (R₂) has to be connect between pin 8 and GND in order to program
the current
8
SYNC
that flows in the C₃ capacitor (pin 9). The values of C₃ and R₂ determine the
time required to bias the amplifier.
The pin will have a capacitor (C₃) tied to GND to set the MUTE/STAND-BY
9
MUTE time.
An automatic Mute during turn on/off is provided to prevent noisy transients.
4/12
Doc ID 6326 Rev 4