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TDA7396 Datasheet(PDF) 8 Page - STMicroelectronics |
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TDA7396 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 11 page CLIPPING DETECTION & DIAGNOSTICS (see fig. 16) An active pull-down circuit is provided to signal out the occurrence of any of the conditions de- scribed later. In order to use this function, the CD- DIA pin (#4) has to be resistively connected to a positive voltage reference (between 5V and Vs). A) Clipping Detection Current is sunk whenever the output clipping dis- tortion level reaches a fixed 0.5% threshold; this function allows gain compression facility when the amplifier is overdriven. B) Output Fault Diagnostics Current is sunk as soon as one of the following output faults is recognized: - short-circuit to GND - short-circuit to Vs - short-circuit across the load (after turn-on) - open load (before turn-on) The diagnostics signal remains steadily on until the fault is removed. All the output fault conditions (listed above) can be distinguished from the clipping detection (A) because of their different time duration. THERMAL WARNING (see fig. 17) Thermal protection has been implemented in ac- cordance to a new principle involving different steps: 1) Thermal foldback (Linear Thermal Shutdown) 2) Shutdown with soft restart (Absolute Thermal Shutdown) As long as the junction temperature remains be- low the preset threshold (140 °C) the IC delivers the full power. Once the threshold has been reached, a thermal foldback starts limiting the out- put signal level; the output power is then reduced, thus decreasing also the temperature without out- put signal interruption (LTS). Supposing the ther- mal foldback does not reduce the junction tem- perature to a safe level, a complete shutdown will occur at 160 °C (ATS). Soft restart avoids large voltage disturbance across the loudspeaker, due to the presence of high input signals when the IC comes out of ther- mal shutdown. Current is sunk from the CD-DIA pin (#4)when the thermal protection is acting. The voltage at pin #4 bounces back and forth (depending on the ampli- fier input signal magnitude) during the linear ther- mal intervention (LTS) and stays low (sinking cur- rent) after the amplifier has been eventually shut-down (Absolute Thermal Shutdown) D93AU005A CLIPPING DETECTOR/ DIAGNOSTICS OUTPUT (pin 4) Vo 0 CLIPPING S/C TO GND NORMAL OPERATION FAULT DIAGNOSTICS NORMAL OPERATION Figure 16: Clipping Detection & Diagnostics Waveforms TDA7396 8/11 |
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