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TLV2186: Output state when supply voltage below the recommended minimum

Nigel
Intellectual 1065 points
Part Number: TLV2186

I would like to use the TLV2186 to modify the feedback of a DC-DC converter, and I want to power the TLV2186 from the output of the DC-DC converter. During normal operation the output of the DC-DC converter ranges from 6 V to 10.5 V, which is well within the recommended supply voltage range for the TLV2186. What I would like to know, however, is the state of the op amp output during start-up, when the output of the DC-DC converter ramps up from 0 V to 4.5 V. Does the op amp output stay low? Does it stay high? Is it completely undefined? Does the TLV2186 include any kind of internal UVLO function (I'm thinking that it might, to ensure correct start up of the chopping circuitry).

Thanks,

Nigel

  • 0
    TI__Guru* 93105 points

    Hi Nigel,

    I just sent an email to our Precision Amplifiers design team with the questions you are asking about the TLV2186 output conditions when Vs< 4.5 V. Let's give them a chance to respond to my email.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0
    TI__Guru* 93105 points

    Hello Nigel,

    I heard back from Design. The TLV2186 has internal power on reset circuitry (POR) that becomes active when the supply voltage is less the 4.5 V minimum. The output becomes a high impedance when the POR is active. Once the supply reaches and exceeds 4.5 V all the internal circuits are fully functional and proper start-up and operation are assured.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to Thomas Kuehl
    TI__Intellectual 1065 points

    Thomas,

    For some reason I only received an email related to your initial answer, so I only saw this today. But this information is exactly what I need, so thanks very much!

    Regards,

    Nigel