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TL082: The output is out of regulation when powered down

Wayne Wang20
Expert 4360 points
Part Number: TL082

Hi team,

Customer is testing our TL082. The chip is powered from +-15V. The yellow curve in the picture is the +15V power supply and the blue curve in the picture is the TL082 output. When the power is shutdown, the +15V drops to 0V. During this, the output of TL082 is out of regulation and follows the positive power supply from 8V to 0V. Do you have any advice on this issue? Thank you

Best regards,

Wayne

  • 0
    TI__Guru*** 139996 points
    Wayne,

    What happens with -15V supply and the input common mode and difference input?
    If IN+ > IN- then output should go high because noninverting input is higher voltage.
    If IN+ < [VCC-][ + 1.5V then output may go high to due forward bias of input JFET transistor (gate to drain).