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TPA3255-Q1: External diagnostic problem consultation

Alan Xia
Genius 11640 points

Part Number: TPA3255-Q1

Hi team,

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1.I noticed that the AN design uses a 12V VCC. Could this voltage be replaced with the 10.6V GVDD of the TPA3255-Q1, allowing the customer to reuse this power rail without needing to design an additional 12V power rail?

Is it possible that the difference in VCC, and the voltage detected for different faults, would still affect the diagnostic functionality?

image.png

2.I see that the detection and diagnostic circuits used in AN are all implemented with operational amplifiers. Is it possible to use ADC sampling to achieve the same result here?

image.png

  • 0
    TI__Guru 61490 points

    Hi Alan

    Alan Xia said:
    I noticed that the AN design uses a 12V VCC. Could this voltage be replaced with the 10.6V GVDD of the TPA3255-Q1, allowing the customer to reuse this power rail without needing to design an additional 12V power rail?

    Possible, need to check the external amplifier's power supply rail. 

    Alan Xia said:
    2.I see that the detection and diagnostic circuits used in AN are all implemented with operational amplifiers. Is it possible to use ADC sampling to achieve the same result here?

    Yes, ADC sampling could be more precise.