OPA1611: Powersupply Bootstrapping Ultra Low Distortion +-15V Amp

Chris Mueller

Part Number: OPA1611
Other Parts Discussed in Thread: TINA-TI, , OPA828

Hi,

I'm planning an ultra low noise & Distortion Speakeramp. I want to reach the voltage (+-50V) to feed the Voltage follower Transistor Out-Stage by Bootstrapping the Powersupply of the OpAmp.

I would like to work with OPA161x or similar.

But it seems that LTSpice simulations for bootstrapping these OPAmps show strange results. There are some OpAmps I can bootstrap (from other companies).

I also can't find any Spice models for your newer ultra low distortion amps. Are there any I can use?

Best regards

Chris

over 3 years ago

0 Marek Lis over 3 years ago

TI__Guru 63700 points

Chris,

You need to be more precise than to say "these op amps show strange results." Have you tried to use Tina-TI simulation tool and if not, here is the link for free download:

https://www.ti.com/tool/TINA-TI?keyMatch=TINA%20TI%20DOWNLOAD

All of our modern op amps have macro-models under their product folder. Here are the links to OPA1611 and OPA828 ultra-low distortion models:

https://www.ti.com/product/OPA1611#design-development

https://www.ti.com/product/OPA828#design-development##design-tools-simulation

0 Chris Mueller over 3 years ago in reply to Marek Lis

Prodigy 10 points

Thanks for the fast answer, I tried to download TINA, 3 weeks or so ago, couldn't install it. I have also PSpice, should I try it there? Thanks, I have the OPA161x .lib-model. I can bootstrap it (in ltspice) until a specific value, e.g. I can't do bigger swings than +-30V. With the OPA161x I can go up to +-14V and then from the Powersupply bootstrap comes another +-14V so about +-28V is possbiel not more. If I want to go higher (with the bootstrap only of course) the sinus becomes "edges".

0 Marek Lis over 3 years ago in reply to Chris Mueller

TI__Guru 63700 points

You should be able to download and install Tina-TI. If you continue having problems, you may also use a different PSpice like PSpice for TI - see link below.

https://www.ti.com/tool/PSPICE-FOR-TI?keyMatch=PSPICE%20FOR%20TI

If you need further help, please show your bootstrapped schematic by inserting its image using INSERT button below.

Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

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OPA1611: Powersupply Bootstrapping Ultra Low Distortion +-15V Amp