I have modified a LT3471 and was able to get it to 18vdc but no higher. According to the datasheet I should be able to get it to 40vdc.

My project requires one ouput of 36vdc and 900mA. The second output requires 18vdc and 500mA, so I have satisfied this one. My input is 12vdc.

I have attached the LTSpice schematic.

Any help appreciated.

 

Please ignore. I figured it out. It has been alot of years without doing any circuit work.