TINA/Spice/OPA4171: OPA171 back to back diode issue

Willy Chen10

Prodigy 220 points

Part Number: OPA4171
Other Parts Discussed in Thread: TINA-TI, , OPA171, TLV171

Tool/software: TINA-TI or Spice Models

hi~

Our customers found that OPA4171 can't operate normally in our application because of the back to back diode.

but we didn't find this problem in our TINA simulation result with OPA171 TINA spice model.

It seems like it doesn't model the back to back diode in OPA4171's model.

Can you offer the modified model with back to back diode

or please tell me how can I model these diodes externally(like forward voltage drop=?...)

Thank you very much!!

over 7 years ago

0 JC Zhu over 7 years ago

TI__Mastermind 30715 points

Hi Willy,

Where did you obtain these models from? These parts should have the same model which can be found in the product folders:

Thanks,
JC

0 Willy Chen10 over 7 years ago in reply to JC Zhu

Prodigy 220 points

Hi JC,

Thanks for your reply!

The model I used was download from the website the same as you pasted.

http://www.ti.com/product/opa171/toolssoftware

but I found that bakc to back diodes were not modeled in the model.

I have to use modified model or know how to model that diode in TINA for our application.

Thank you!!

Willy

0 Collin Wells over 7 years ago in reply to Willy Chen10

TI__Guru 62905 points

Hi Willy,

Consider using the TLV171 model which does include circuitry to model the behavior of the back-to-back diodes inside the OPA171 and TLV171 devices.
www.ti.com/.../toolssoftware

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TINA/Spice/OPA4171: OPA171 back to back diode issue