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PCM5100A-Q1: how to survive under short to battery or short to ground?

Sherry Liang
Genius 10255 points
Part Number: PCM5100A-Q1

Dear team,

This device's output  doesn't have the short to ground and short to battery functions, right? My customer needs to do such tests: output short to ground and output short to battery. If they do such tests on the device, will our device break down? If so, do we have any solution to let our device  pass the two tests? Below is the schematic.

Thanks & Best Regards,

Sherry

  • 0
    TI__Guru 52663 points

    Hi Sherry,

    I assume the battery is 12-14V? If the output is directly connected to the battery, the ESD cells will activate and technically the abs. max conditions would be violated. As the abs. max values are given to process, it cannot be guaranteed that the device will not be damaged.  If the test requires only that the output of the circuit (KTV_OUT_L, R) is shorted to the battery, then the resistor will help in this scenario.  I recommend adding some kind of TVS protection on the output of the circuit to help protect the device.

    Thanks,

    Paul

  • 0 in reply to Paul_Frost
    TI__Genius 10255 points

    Hi team,

    If I add a capacitor on the output signal as below , is it ok? 

    About the TVS solution, because the short to battery test and short to ground test will last for one minute, the TVS solution maybe is not useful.

    Thanks & Best Regards,

    Sherry

  • 0 in reply to Sherry Liang
    TI__Guru 52663 points

    Hi Sherry,

    I suspect a zener diode would be better than the caps.  The DC blocking caps will still have a fC, so depending on the ramp of the battery short the pin could still violate the abs. max condition.

    Thanks,

    Paul