OPAMP recommendation inquiry

JH Shin

Guru 12815 points

Hi,

Could you please recommend an OPAMP that meet the conditions below ?

- Rail to Rail OPAMP, VCC > ±5V, Vin = -2V ~ -5V, Vout capacitive load = 1uF

If possible, please provide the application example or simulation file.

Thanks a lot.

over 6 years ago

0 kai klaas69 over 6 years ago

Guru 140200 points

Hi JH,

Kai

0 Tim Claycomb over 6 years ago

TI__Genius 15410 points

Hi JH,

Very few or no op amps can directly drive a 1uF capacitive load. Please see our TI Precision Lab Videos on Stability for more information.

Is there a maximum bandwidth you need?

Thank you,

Tim Claycomb

0 JH Shin over 6 years ago in reply to Tim Claycomb

Guru 12815 points

Hi,

Thank you for your reply.

The availabliltiy of a 1uF capacitive load is the main concern for OPAMP selection.

I couldn't find a rail to rail OPAMP that included this application example.

The input of OPAMP is only negative voltage level(-2V ~ -5V).

Is there an OPAMP with the application example ?

Best Regards,

0 kai klaas69 over 6 years ago in reply to JH Shin

Guru 140200 points

Hi JH,

as already mentioned by Tim, the usual method to treat big capacitive loads is the "Riso + Dual Feedback" methode which is discussed in this TI's stability training video:

Can you tell more about your application?

Kai

0 JH Shin over 6 years ago in reply to kai klaas69

Guru 12815 points

Hi Kai,

This application is the gate drive control of TR.I think TI's stability training you provided will help with this application.

Thank you for your help.

Regards,

0 kai klaas69 over 6 years ago in reply to JH Shin

Guru 140200 points

Hi JH,

feel free to come back, if you have a question :-)

Kai

0 Tim Claycomb over 6 years ago in reply to kai klaas69

TI__Genius 15410 points

Hi JH,

If you need help with a stability analysis please let us know.

Hi Kai,

Thank you for the help!

- Tim Claycomb

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OPAMP recommendation inquiry