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关于LM3409通过DAC芯片调节电流问题

Other Parts Discussed in Thread: DAC7311, TIDA-01415

 我参考TIDA-01415的设计,画了一个测试板,测试了不接外部控制时的电流正常,通过PWM调节正常,外接电阻连接IADJ1和地输出电流正常,但是通过DAC7311芯片调节电压来控制,输出电流的非常小,且不可控制,想问下是哪里设计错误了?