TDA7375AV(2008) 查看數據表（PDF） - STMicroelectronics

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TDA7375AV
(Rev.:2008)

2 x 37 W dual/quad power amplifier for car radio

STMicroelectronics 

Functional description

Figure 25. Output fault waveforms (see Figure 26)

TDA7375AV

4.7

Figure 26. Fault waveforms

ST-BY PIN

VOLTAGE

2V

OUTPUT

WAVEFORM

OUT TO Vs SHORT

SOFT SHORT

Vpin 10

OUT TO GND SHORT

CORRECT TURN-ON

FAULT DETECTION

CHECK AT TURN-ON

(TEST PHASE)

D94AU149A

t

t

t

SHORT TO GND

OR TO Vs

Handling of the diagnostics information

As various kinds of information is available at the same pin (clipping detection, output fault,

thermal proximity), this signal must be handled properly in order to discriminate each event.

This could be done by taking into account the different timing of the diagnostic output during

each case.

Normally the clip detector signalling produces a low level at pin 10 that is shorter referred to

every kind of fault detection; based on this assumption an interface circuitry to differentiate

the information is represented in the following schematic.

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