Multisim and Ultiboard

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NCP1028 Constant current LED driver. Which parts of the circuit to I need to ground? why is the current reaching kA?

can't be

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Message 11 of 13

I'm pretty sure that the circuit itself is OK, because it's an official schematic of an ON semiconductor NCP1028LED Evaluation Board. It does work in practice but problems occure in Multisim, so I suspect the program doesn't like something. 

but thanks for trying to help 🙂

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Message 12 of 13

hello, would you share how to make such analisis

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Message 13 of 13