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Negative input negative output with buck converter

Other Parts Discussed in Thread: LM5001

Hi, I have a requirement to generate -5V supply from -15V supply. My current requirement is 500mA. Though some material is available (referred the one in eetimes using LM5001) the design procedure of such a regulator is not mentioned. If somebody could provide some information or share circuit diagrams of similar regulators it would be of great help. The ripple limit should be 50mV.