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TDA7396 Scheda tecnica(PDF) 4 Page - STMicroelectronics |
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TDA7396 Scheda tecnica(HTML) 4 Page - STMicroelectronics |
4 / 11 page 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 A resistor (RS) has to be connect between pin 10 and GND in order to program the current that flows into CM capacitor (pin 11). The values of CM and RS determine the time required to bias the amplifier. 11 MUTE a) The pin will have a capacitor (CM) tied to GND to set the MUTE/STAND-BY time. An 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 be connected to this pin; 1% precision resistors have to be used for REXT / RS in to order to reach the fixed limits 0.63 ≤ REXT / RS ≤ 0.69 1 2 11 IN- 0.22 µF 0.22 µF IN+ 8 STANDBY TO µC or 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 |
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