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TDA7374BV Datasheet(PDF) 7 Page - STMicroelectronics |
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TDA7374BV Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 13 page  OUTPUT STAGE The fully complementary output stage was made possible by the development of a new compo- nent: the ST exclusive power ICV PNP. A novel design based upon the connection shown in fig. 13 has then allowed the full exploitation of its possibilities. The clear advantages this new approach has over classical output stages are as follows: 1 - Rail-to-Rail Output Voltage Swing With No Need Of Bootstrap Capacitors. The output swing is limited only by the Vcesat of the output transistors, which are in the range of 0.6 Ohm each. Classical solutions adopting composite PNP-NPN for the upper output stage have higher saturation loss on the top side of the waveform. This unbal- anced saturation causes a significant power re- duction. The only way to recover power consists of the addition of expensive bootstrap capacitors. 2 - Absolute Stability Without Any External Compensation. Referring to the circuit of Fig. 13 the gain VOUT/VIN is greater than unity, approximately 1 + R2/R1. The DC Output (VCC/2) is fixed by an aux- iliary amplifier common to all the channels). By controlling the amount of this local feedback it is possible to force the loop gain (A * β) to less than unity at frequency for which the phase shift is 180 Deg. This means that the output buffer is intrinsically stable and not prone to oscillation. Most remarkably, the above feature has been achieved in spite of the very low closed loop gain of the amplifier. In contrast, with the classical PNP-NPN stage, the solution adopted for reducing the gain at high frequencies makes use of external RC networks, namely the Boucherot cells. OTHER OUTSTANDING CHARACTERISTICS: Clipping Detector Output The TDA7374B is equipped with an internal cir- cuit able to detect the output stage saturation pro- viding a proper current sinking into a open collec- tor output (pin 10) when a certain distortion level is reached at each output. This particular function allows gain compression facility whenever the amplifier is overdriven, thus obtaining high quality sound at all listening levels. Figure 13: The new Output Stage Figure 14: Clipping Detection Waveforms TDA7374B 7/13 |
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