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LM5170: Lm5170实测处于非工作状态,不知原因

Part Number: LM5170

做了一个lm5170的验证板,但是不能正常工作。粗始设置如下,12v高压端输入,再稳压输出5伏作为使能信号和方向信号,因为器件为电流型器件,设置了大概0.7v的设置电压,按电路计算应该是1安左右的恒流输出,低压端输出接5欧电阻,按这种电路输出应该是5伏。但实际没有电压输出,上电时消耗电流只有几个毫安。不知是我对电路理解有误还是电路设计错误。