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How can i use the LM2841 to implement a negative -15v input,positive output +3.3v

Other Parts Discussed in Thread: LM2841, LM2733, LM5002

below picture is the LM2841 positive +15v input,positive output +3.3v.

How can i use the LM2841 to implement a negative -15v input,positive output +3.3v.