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Webench/LM2576: Problem with selecting an operation amplifier

Part Number: LM2576
Other Parts Discussed in Thread: TINA-TI

Tool/software: Webench

Hello,

I am new to Webench, so sorry if this is a silly question. I just created a schematic using the adjustable version of LM2576. The thing is I experimented with adding an additional opamp. However, the software doesn't let me choose opamp. It says that there aren't available parts. I tried to run a simulation without choosing a specific component, but it failed. 

Thank you in advance!

Ivan Vlaykov