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WEBENCH® Tools/LM3478: How to get 140 V

Part Number: LM3478
Other Parts Discussed in Thread: LM2585,

Tool/software: WEBENCH® Design Tools

I am working on a vlc project. I am trying to bias an APD at 140 V from a 5-10 V input. This says on the specs that it has an input range from 3-40 V and output range from ~1-300 V for the LM 3478. When I saw this I thought it could work but when I tried to get Webench to create a design and it said it couldn't and to lessen the current so I got a little confused and changed the current to 1 mA and it made a circuit using the LM2585. The simulation seems to have the correct output but I wanted to see it for a longer period of time. When I expand the bounds on the waveform for time in the steady state simulation it only shows it for a very short time then cuts off. How do I make the simulation run for a longer period of time in webench? How can I get an IC like the LM2585 in pSpice? I downloaded the big zip file for ti pspice files but it is still not there. Will the  LM 3478 work even though webench cant make a circuit? How do I adjust both of these ICs if used? Thanks. Sorry for all the questions.