• TI Thinks Resolved

TINA/Spice/OPA320: Problem using SPICE model in LTSpice

Genius 3555 points

Part Number: OPA320

Tool/software: TINA-TI or Spice Models

Hi,

I want to simulate the OP320 in LTSpice. I know TI does not support LTSpice but there are reasons for us to use LTSpice intead of TINA. Also simulating OPA2192 in LTSpice was successful.
It looks as if the results for DC anslysis are ok. But AC analysis results look strange. The test circuit is a Sallen-Key low pass filter. If the supply voltage is 5V (single supply) AC analysis result is correct. If supply voltage is 3.3V then AC analysis result is wrong. Doing the same simulation with OPA2192 all the AC analysis results are ok.

Attached are two print screens showing both 5V and 3.3V supply case and corresponding AC analysis results.

Any ideas what might be the problem?

Thanks and best regards,

Patrick