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How to choose the right OpAmp for a precise power supply?

Egor Tamarin
Prodigy 110 points
Other Parts Discussed in Thread: OPA277, OPA192

Hello everyone!

I am a student, and I was tasked with building a 12 V linear power supply. I had the following in mind:

Take a precision voltage reference (REF5050, for example), then use 2 OpAmps to buffer it and increase the voltage from 5 to 12V, then amplify the current. However, I am confused by such variety of precision OpAmps. I had OPAx197 or OPA277 in mind, but I can't properly choose between them.

How can I choose an OpAmp for this job?

  • 0
    TI__Guru 64205 points
    Hi Egor,

    Have you considered a linear regulator / LDO for the 12V output? It will be much better at providing high levels of current and driving a large capacitive load than an op amp circuit.

    If you'd like to continue down the route you're on, then check out the OPA192. It's a really good product and can drive moderate capacitive loads pretty well without advanced compensation. If you need to drive higher currents or large cap loads then consider using a power op amp such as the OPA54x or OPA56x devices.