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LM5025A高压有源嵌位

输入电压125Vdc 输出±15V ,3A ,90W;
第一个问题高压输入的时候可以在VIN上串电阻作启动电阻吗?可以的话VIN启动电流多大,不可以的话什么芯片可以做了?
第二个问题有源嵌位一定要同步整流嘛,二极管整流行不行?