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LM3409: LM3409的引脚Iadj用DAC8568提供一个0.2到1V电平,再芯片输入引脚测量出相关电平,但是芯片不受控制

Part Number: LM3409

   原理图如下,示波器中又coff电平,右边绿色为Iadj电平,黄色为led电压,尝试过很多方式都无法控制输出电流,不知道为什么