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LM5088



LM5088MH-2,输入电压47V,输出电压21V,我设计电压是28V,FB只有0.9V,为什么FB不是1.205V呢?正常来说输出电压要达到28V的,为什么只有21V呢?还有手册上说Uo≥5V,Uramp应该接上电阻的,我接上60K电阻到VCC,Uo=0V,知道的告诉我,谢谢