TDA7561H 查看數據表（PDF） - STMicroelectronics

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TDA7561H

Multifunction quad power amplifier with built-in diagnostics features

STMicroelectronics 

TDA7561

Diagnostics functional description

Figure 18. SVR and output pin behaviour (case 2: with turn-on diagnostic)

6 SVR

/UT

4URNONDIAGNOSTIC

ACQUISITIONTIMEM34YP

0ERMANENTDIAGNOSTIC

ACQUISITIONTIMEM34YP

$IAGNOSTIC%NABLE

4URNON

4URNON$IAGNOSTICSDATAOUTPUT

PERMITTEDTIME

T

$IAGNOSTIC%NABLE

0ERMANENT

&!5,4

EVENT

) # " $ !4!

"IASPOWERAMPTURNON

PERMITTEDTIME

2EAD$ATA

0ERMANENT$IAGNOSTICDATAOUTPUT

PERMITTEDTIME

'!0'03

The information related to the outputs status is read and memorized at the end of the

current pulse top. The acquisition time is 100 ms (typ.). No audible noise is generated in the

process. As for short to GND / Vs the fault-detection thresholds remain unchanged from 26

dB to 12 dB gain setting. They are as follows:

Figure 19. Short circuit detection thresholds

3#TO'.$ X .ORMAL/PERATION X

3#TO6S

6

6 6

636 636

63

'!0'03

Concerning short across the speaker / open speaker, the threshold varies from 26 dB to 12

dB gain setting, since different loads are expected (either normal speaker's impedance or

high impedance). The values in case of 26 dB gain are as follows:

Figure 20. Load detection thresholds - high gain setting

3#ACROSS,OAD X .ORMAL/PERATION X

/PEN,OAD

6

7 7

7

7

)NFINITE

'!0'03

If the line-driver mode (Gv = 12 dB and line driver mode diagnostic = 1) is selected, the

same thresholds will change as follows:

Figure 21. Load detection threshold - low gain setting

3#ACROSS,OAD X .ORMAL/PERATION X

/PEN,OAD

7

7 7

7 7

INFINITE

'!0'03

Doc ID 8326 Rev 6

13/27

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