STA543SA

5 General structure

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5.7.1

Diagnostic Facilities (Pin 12)

The STA543SA is equipped with a diagnostic circuitry 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 12) through a current sinking

when the event is detected

Figure 10. Clipping Detection Waveforms

A current sinking at pin 12 is provided when a certain distortion level is reached at each output.

This function allows gain compression facility whenever the amplifier is overdriven.

5.7.2

Thermal Shutdown

In this case the output 12 will signal the proximity of the junction temperature to the shutdown

threshold. Typically current sinking at pin 12 will start ~10°C before the shutdown threshold is

reached.

Figure 11. Output fault waveforms