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LR8电源芯片供电不正常



输入电压是10-250V单相交流,要求输出5V,现象是:在输入低压的时候,输出电压稳定,输入210V的时候,输出电压不稳定,被拉低到一点几伏,请问是电容选的不对吗?手册上说C9的电容,为了输出稳定,要大于1uf