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TDA7391PD Datasheet(PDF) 4 Page - STMicroelectronics |
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TDA7391PD Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 8 page FUNCTIONAL DESCRIPTION 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 +VS 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 P-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 A resistor (R2) has to be connect between pin 8and GND in order to program the current 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. TDA7391PD 4/8 |
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