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Fusion Digital Power Designer - 40V output is not possible

Other Parts Discussed in Thread: UCD9244, UCD9222

Hello,

I am using a UCD9244 and UCD9222 to generate 40V from a 48V supply.  This seems plausible according to my understanding.

When I enter the voltage output in Fusion Digital Power Designer, it keeps giving a warning and I am unable to design with this.

In the interim I have 'cheated' by designing for a 10V output and scaling the feedback resistors accordingly.  I have not been able to verify this on the hardware yet (software colleague is currently working on code to send messages).

Why can't I set the output voltage at 40V?

Thank you, Steve