OPA376: Output behavior on power-up

Daisuke Higa

Part Number: OPA376

Tool/software:

Hi support team.

Is the following waveform correct as the output behavior when the power supply starts up?
(The output traces the power supply, reaches the upper limit of 5V, and then drops.)

Vi(+) is connected to the sensor and the OPA376 is a voltage follower.

Best regards,

Higa

Best regards,

Higa

over 1 year ago

+1 Marek Lis over 1 year ago

TI__Guru* 75091 points

It may take OPA376 up to 100us (after meeting a minimum supply of 2.2V) for the internal nodes to properly converge under power-up condition and until then the op amp runs open-loop; thus, its output may be anywhere between the supplies. In fact, under power-up Vout may randomly jump back-and-forth between its rails.

0 Daisuke Higa over 1 year ago in reply to Marek Lis

Genius 5015 points

Hi Marek-san

Thank you for your prompt reply.

I understood.

Thanks!

Regards,

Higa

0 Marek Lis over 1 year ago in reply to Daisuke Higa

TI__Guru* 75091 points

No problem. Good luck.

Amplifiers

Amplifiers forum

OPA376: Output behavior on power-up