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OPA4277-EP:Whether a voltage drop occurs in a specific situation

상은 박
Prodigy 60 points
Part Number: OPA4277-EP
Other Parts Discussed in Thread: OPA4277

The circuit is as follows :

Are there any factors that cause the opa4277-ep to drop in voltage under certain circumstances?

The voltage drop occurred at 40,000 feet.

Please let me know if you have any similar cases

  • 0
    TI__Guru* 93105 points

    Hi,

    • Is it a change in the OPA4277-EP output voltage that is being observed at the 40,000 foot altitude, or a different voltage?
    • How much of a voltage change?
    • What supply voltage are being applied to the OPA4277-EP?
    • Is the OPA4277-EP in a constant pressure environment at all altitudes?

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to Thomas Kuehl
    Prodigy 60 points

    The answer to the question is as follows.

    - Change of OP4277-EP output voltage

    - 4V ref. Voltage drops to 3.5V

    - The supply voltage is +/- 15V.

    - No, the pressure changes depending on the altitude environment.

    Thank you

  • 0 in reply to 상은 박
    TI__Guru* 93105 points

    Hello 상은 박

    A -500 mV shift in the OPA4277 output voltage at the 40,000 foot altitude would indicate a major electrical change occurred in the op amp. This would not be an expected behavior.

    • Has the voltage at the OPA4277 input coming from the voltage divider been monitored to make sure the voltage shift isn't occurring at that point in the circuit?
    • Does the -500 mV shift remain once the OPA4277 has returned back to low altitude, or does the output move back to +4.0 V at low altitude?

    Regards, Thomas

    Precision Amplifiers Applications Engineering