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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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TDA7381 Arkusz danych(PDF) 7 Page - STMicroelectronics |
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TDA7381 Arkusz danych(HTML) 7 Page - STMicroelectronics |
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7 / 10 page  OUTPUT MISCONNECTIONS (OUT-GND & OUT-Vs shorts) Diagnostics information is available across an open collector output located at pin 25 (fig. 4) through a current sinking whenever at least one of the above events is recognized. Among them, the CLIPPING DETECTOR acts in a way to output a signal as soon as one or more power transistors start being saturated. As a result, the clipping-related signal at pin 25 takes the form of pulses, which are perfectly syn- cronized with each single clipping event in the music program and reflect the same duration time (fig. 5). Applications making use of this facility usually operate a filtering/integration of the pulses train through passive R-C networks and realize a volume (or tone bass) stepping down in associa- tion with microprocessor-driven audioprocessors. The maximum load that pin 25 can sustain is 1K Ω. Due to its operating principles, the clipping detec- VREF R Vpin 25 25 D95AU303 TDA7385 Figure 4: Diagnostics circuit. Figure 5: Clipping Detection Waveforms. TDA7381 t t t MUTE PIN VOLTAGE Vs OUTPUT WAVEFORM Vpin 25 WAVEFORM SHORT TO GND OR TO Vs D95AU304 CLIPPING THERMAL PROXIMITY ST-BY PIN VOLTAGE t Figure 6: Diagnostics Waveforms. TDA7381 7/10 |
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