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15W以内DC-DC,寻找替代UC3843的芯片,急!急!急!

Other Parts Discussed in Thread: UC3843, LM2698, LM5022, LM3481, LM5160

 目前DC-DC采用UC3843,单端,正激拓扑结构,24V输入,输出24V,5V,-5V等三路输出,各路电流均低于0.5A,总功率在15W以内,但DC DC体积偏大不理想,想寻找一款芯片替代UC3843,请推荐芯片型号和拓扑结构,使DC DC体积更小,效率更高,谢谢!