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LM25118稳压输出,输入降不下去

目前的电路参照官方手册进行设计,目前5V输入,输出只有1.9V电压,输入6V 的时候,输出12V,空载和负载都测试过了,效果相同,目前是需要5V输入,附件是目前的原理图,是否哪里需要调整?25118.pdf