DC Sweep graph

I'm analysing the LM317 with a 12Vin to get an output of 4V. R1 is 240Ohm and R2 is 525 The voltmeter confirms that R1 and R2 connected to LM317 with a Vin of 12V delivers 4V. However, when I do a DC Sweep of R2 from 0-5kOhm in linear mode with steps of 100Ohm, the graph suggests that R2 needs to be about 780Ohms in order to have an output of 4V. But the voltmeter clearly shows that R2 needs to be 525Ohm to deliver 4V. Any help is greatly appreciated.

by Benafsha
June 04, 2020

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