TDA7391PD Datasheet, PDF (4/8 Pages) STMicroelectronics – 32W BRIDGE CAR RADIO AMPLIFIER

TDA7391PD
FUNCTIONAL DESCRIPTION
Pin
Function
14,
15
INPUTS
5,16
+V_S
17
CD
2,19
OUTPUTS
1,10,
11,20
P-GND
Description
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.
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.
Power Ground.
12
S-GND
Signal Ground.
The device features a ST-BY function which shuts down all the internal bias supplies
4
STAND-BY
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 8and 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.
9
MUTE
The pin will have a capacitor (C₃) tied to GND to set the MUTE/STAND-BY time. An
automatic Mute during turn on/off is provided to prevent noisy transients.
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