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TDA7375AV Datasheet(PDF) 10 Page - STMicroelectronics |
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TDA7375AV Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 14 page rect operation for the device itself and for the loudspeaker. This particular kind of protection acts in such a way to avoid the device is turned on (by ST-BY) when a resistive path (less than 16 ohms) is pre- sent between the output and GND. As the in- volved circuitry is normally disabled when a cur- rent higher than 5mA is flowing into the ST-BY pin, it is important, in order not to disable it, to have the external current source driving the ST- BY pin limited to 5mA. This extrafunction becomes particularly attractive when, in the single ended configuration, one ca- pacitor is shared between two outputs (see fig. 21). Supposing that the output capacitor Cout for any reason is shorted, the loudspeaker will not be damaged being this soft short circuit condition re- vealed. Diagnostic Facilities The TDA7375 is equipped with a diagnostic cir- cuitry able to detect the following events: Clipping in the output signal Thermal shutdown Output fault: – short to GND – short to VS – soft short at turn on The information is available across an open collector output (pin 10) through a current sink- ing when the event is detected A current sinking at pin 10 is provided when a cer- tain distortion level is reached at each output. This function allows gain compression facility when- ever the amplifier is overdriven. Thermal Shutdown In this case the output 10 will signal the proximity of the junction temperature to the shutdown threshold. Typically current sinking at pin 10 will start ~10 °C before the shutdown threshold is reached. HANDLING OF THE DIAGNOSTIC INFORMA- Figure 21. Figure 22: Clipping Detection Waveforms Figure 23: Output Fault Waveforms (see fig. 24) TDA7375A TDA7375A 10/14 |
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