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OPA237 Powering on

David Graves
Prodigy 30 points
Other Parts Discussed in Thread: OPA237

I am redesign a circuit with a unity gain buffer that I have had difficulty with due to the dual supply op amp requires the +/- rail voltage to come up equally (the dc-dc converter that powers this circuit the negative voltage comes up 4-6mS later than the positive voltage; its locked into the design). I have used the OPA237 single or dual power op amp before, the question is would this delay in the start up of the negative voltage adversely affect, stress or otherwise be ultimately detrimental to the OPA237? I'm assuming that this can be used as a single supply,  the powering up is not as critical and this delay would not hurt me.... wrong?

  • 0
    TI__Guru 60610 points

    David,

    You do not need to worry about damaging OPA237 in dual supply application due to uneven ramp up of the power supplies as long as the input common-mode voltage is kept at all times within power supplies range.  In other words, as long as the input voltage is not above positive or below negative rail by more than few hundred mV, OPA237 will not be adversely affected.

    However, delaying in coming up of negative supply may result is longer start-up time of OPA237 (for example, in case Vcm being grounded) since the output will stay saturated (in non-linear operation) until the negative supply is at or below -0.5V - see output voltage swings below.