OPA310: Power Up with volotage on Vin+/Vin-

Evan Peng

Part Number: OPA310

Tool/software:

Hi Expert,

This is Shenzhen FAE Evan. My customer is evaluating OPA310 as current sense amplifier. One of the application scenarios is that, the current set up first and then shunt has a voltage drop on Vin+ and Vin-, and then VCC of OPA310 is powered up by 3.3V. I have to confirm, if this kind of power up timing sequence will result unexpected output wave or other risk?

Regards,

Evan

over 1 year ago

0 Robert Clifton56 over 1 year ago

TI__Mastermind 28120 points

Hi Evan,

Can you provide a schematic so we can get a better idea of a risk assessment?

Thank you,

Robert Clifton

0 Evan Peng over 1 year ago in reply to Robert Clifton56

TI__Intellectual 1405 points

Hi Robert,

Please see the schematic below

Regards,

Evan

0 Robert Clifton56 over 1 year ago in reply to Evan Peng

TI__Mastermind 28120 points

Hi Evan,

I ran a stability analysis on all of the circuits and each of them were stable with over 70 degrees of phase margin so there's no concern from stability.

What are the voltages that you are expecting on the input pins before the 3.3V supply rail turns on?

Best Regards,

Robert Clifton

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OPA310: Power Up with volotage on Vin+/Vin-