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UCC28740-Q1: Alternate IC for UCC28740-Q1

Part Number: UCC28740-Q1


I want to design a two switch flyback (400V-15V 1.5A).I have come across the IC UCC28740-Q1.But the maximum switching frequency of this IC is found to be 100Khz.We need a bit higher swicthing frequency.Could you suggest any alternate IC ? or could you suggest lower voltage input IC that can be powered up using auxiliary winding.