TDA7567PD View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TDA7567PD

4 x 50 W differential quad power amplifier with built-in diagnostics features

STMicroelectronics 

TDA7567PD

Diagnostics functional description

Figure 7. SVR and output pin behavior (case 2: with turn-on diagnostic)

Vsvr

Out

Turn-on diagnostic

acquisition time (100mS Typ)

Permanent diagnostic

acquisition time (100mS Typ)

t

Diagnostic Enable

(Turn-on)

Turn-on Diagnostics data (output)

permitted time

Diagnostic Enable

(Permanent)

FAULT

event

Bias (power amp turn-on)

permitted time

Read Data

Permanent Diagnostics data (output)

permitted time

I2CB DATA

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 16 dB gain setting. They are as follows:

Figure 8. Short circuit detection thresholds

S.C. to GND x Normal Operation x

S.C. to Vs

0V

1.2V 1.8V

VS-1.8V VS-1.2V

VS

D01AU1253

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

16 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 9. Load detection thresholds - high gain setting 26 dB

S.C. across Load x Normal Operation x

Open Load

0V

0.5Ω 1.5Ω

45Ω

85Ω

Infinite

AC00060

If the line driver mode (Gv = 16 dB and line driver mode diagnostic = 1) is selected, the

same thresholds will change as follows:

Figure 10. Load detection thresholds - low gain setting 16 dB

S.C. across Load x Normal Operation x

Open Load

0Ω

1.5Ω 7Ω

180Ω 330Ω

infinite

Doc ID 16903 Rev 1

13/30

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