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Hi
可以借助TI的webench做芯片选型:http://www.ti.com.cn/tihome/cn/docs/homepage.tsp
LM5085电路如下:
电路比较简单,效率高达97%以上,常温下芯片温度40℃以内。
或者选择隔离方案也是可以的,例如TPS40210,做反激,相对要负载一点。