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LM5574 positive to negative DC DC converter

Other Parts Discussed in Thread: LM5574

LM5574  I really need help with a design. I built a +9V to -50V converter using the LM5574.  With no load attached, its running at max duty cycle.  I've replaced the output capacitor and still same.  I used WebBench for this and I've checked my layout for errors. I can't find an error.  WOuld someone with experience or knowledge of this device PLEASE get back to me.  I've been trying to solve this for 3 days and I'm out of ideas.